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Gm Goodwrench Service

The Goodwrench Advantage

From maintenance to major repairs, your GM Goodwrench Service dealership is your one-stop shop for all your vehicle needs.

At your local Goodwrench Service Dealership you get:

  • GM certified technicians who know your GM vehicle inside and out.
  • Technicians who are equipped with state of the art diagnostic equipment and engineers, enabling quick and accurate diagnosis.
  • Service experts who know the maintenance schedule for your Chevrolet, Buick, GMC, Cadillac and Pontiac, Saturn, Hummer or Oldsmobile.
  • Service experts who recommend what service is required and when, according to your vehicle maintenance schedule, your environment and your personal driving habits.
  • A choice of certified parts to suite your budget and driving habits.
  • A comprehensive explanation of the services performed on your vehicle, so you can stay informed of your vehicle's needs.

Best of all, Goodwrench Service dealerships offer 'Service Your Way'. Many of our dealerships offer quick service for everyday maintenance services, shuttles to home or work, as well as updated, comfortable waiting lounges and the opportunity to check out the latest vehicles.

...all at competitive prices...

That's the Goodwrench Advantage.

Goodwrench Service

At Goodwrench Service we're driven by GM technology. The same innovations that make your driving experience remarkable make our maintenance extraordinary. Our factory-trained technicians have the know-how and the GM-approved diagnostic tools and equipment to service your vehicle right.

Some of these same technologies also have less of an impact on the environment - easier on your pocketbook and easier on the environment, talk about a winning combination!

GM Technologies

Tech II

Tech II is an advanced diagnostic tool specifically designed for GM vehicles. Goodwrench Service technicians use this sophisticated software to instantly access the very latest service inspection information.


GM was the first to use DEX-COOL™ long lasting, corrosion inhibiting engine coolant as a standard production product. For you, this means less hassle. With proper recommended maintenance DEX-COOL™ requires changing just once every five years (or 240,000 km) instead of every two years like regular coolants*. DEX-COOL™ contains no phosphates, silicates or nitrates. It is recyclable, and its longer life also means less impact on the environment in terms of disposal and the consumption of non-renewable resources. If your vehicle has DEX-COOL™, Goodwrench Service technicians will only use DEX-COOL™. If it doesn't, they'll be sure to use the right coolant for your vehicle*.

* Maintenance requirements vary with use and driving conditions. See Owner's Manual for more information. Warning, do not mix DEX-COOL with other coolants.

Platinum-Tipped Spark Plugs

All GM vehicles are equipped with long lasting platinum-tipped spark plugs. They conduct electricity more effectively than standard spark plugs for improved fuel economy and smoother acceleration. They are also an integral part of GM engine technology that has reduced harmful emissions by more than 90% since the 1970's. Platinum-tipped spark plugs only need to be replaced every 166,000 km*. Goodwrench Service technicians only use platinum-tipped spark plugs and only replace plugs when they need replacing.

* Maintenance requirements vary with use and driving conditions. See Owner's Manual for more information.

Platinum-Tipped Spark Plugs

All GM vehicles are equipped with long lasting platinum-tipped spark plugs. They conduct electricity more effectively than standard spark plugs for improved fuel economy and smoother acceleration. They are also an integral part of GM engine technology that has reduced harmful emissions by more than 90% since the 1970's. Platinum-tipped spark plugs only need to be replaced every 166,000 km*. Goodwrench Service technicians only use platinum-tipped spark plugs and only replace plugs when they need replacing.

* Maintenance requirements vary with use and driving conditions. See Owner's Manual for more information.

Tire Pressure Monitor

Tires can lose up to one pound of pressure per square inch a month without notice. General Motors developed the Tire Pressure Monitor (TPM) to alert drivers before tire inflation levels become dangerous.* Keeping tires properly inflated also extends tire life and reduces wear on other components. Reducing wear means consuming fewer natural resources (and creating less waste) by extending component life. Goodwrench technicians will recalibrate the TPM whenever your tires are rotated.

*Note: It is important to check tire pressure on a regular basis whether your vehicle has the TPM or not. Only available on some GM vehicles.


Extended-life, oxidation-resistant Dexron-III transmission fluid is designed to last the lifetime of your vehicle under regular driving conditions*. Because this product lasts longer, less petrochemicals are required or have to be disposed of. Goodwrench Service technicians know when your transmission fluid doesn't need changing, saving you time and money.

* Maintenance requirements vary with use and driving conditions. See Owner's Manual for more information.

GF4 Motor Oil

Identifiable by its distinctive "Starburst" symbol, GF4 Motor Oil has a longer life and contributes to increased fuel efficiency, increased emissions system protection* and reduced oil consumption. Fewer oil and oil filter changes save you time and money. Using (and disposing of) less petrochemicals means a reduced impact on the environment. Whether your vehicle has GF4 Motor Oil or not, Goodwrench Service technicians only change your oil when it's required.

* Maintenance requirements vary with use and driving conditions. See owner's manual for more information.

Our Services

Battery Service

A properly charged battery is necessary to the ongoing operation of your vehicle. Find out more by clicking on the topics below.

Battery Basics

A car battery is a type of rechargeable battery that supplies electric energy to a vehicle. Automotive starter batteries are usually of lead-acid type and are used to power the starter motor, the lights and the ignition system of a vehicle's engine.

Once your vehicle's engine is turned on, an alternator powers the vehicle's electrical systems and restores charge used from the battery during engine cranking.

Battery Maintenance

You may need to replace your battery if:

  • Your vehicle has trouble starting
  • The eye (if equipped) on your battery is dark or clear
  • Your battery is more than 5 years old

Common battery failures include:

  • Loss of electrolyte due to age, under hood heat or overcharging
  • Deep discharges (leaving your lights on)
  • Misapplication or using an undersized battery
  • Undercharging or loose alternator belt
  • Excessive vibration (loose hold-down or mounting)
  • Using tap water for electrolyte
  • Corrosion
  • Freezing

How To Choose

ACDelco is your best choice for a long-lasting, reliable battery. Choose between Professional Series (car and truck batteries), 60 Series (car, truck, and marine batteries) and Voyager Series (marine and RV batteries).

Overall, ACDelco batteries include the following features:

  • Safe and reliable performance
  • Meet or exceed the vehicle's electrical needs
  • Durability (long life)
  • Low self-discharge
  • No water loss
  • Resistant to cycling
  • Resistant to vibration
  • Resistant to corrosion
Professional Series Battery
  • Brand recognition as a premium battery with many years of proven performance
  • Warranties of 5, 6 or 7 years with free replacement up to 50 months
  • Comprehensive coverage from small passenger vehicles to SUVs
  • High grade materials and components ensure maximum performance
  • Meets GM factory warranty replacement requirements
60 Series Battery
  • Offered at market-driven, competitive pricing
  • Competitive limited warranty and free replacement limited warranty
  • Manufactured with computer-controlled processes and/or monitored with hundreds of quality control checks to help ensure ACDelco quality and consistency
  • Provides replacement options
Voyager Series Battery

Internal Design Features:

  • High Density Paste
  • Wrought lead/calcium alloy
  • Small window and center lug
  • Thermoplastic reinforced plates
  • High quality cast on strap and inter cell
  • Welding
  • Cold forged terminal

External Design Features:

  • Heat Sealed Case/Covers
  • Built-in "Green Eye" hydrometer
  • Contoured handgrips

Brake Service

Brakes are an important part of your vehicle's operation.

Brake Basics

We all know that pushing down on the brake pedal slows your vehicle to a stop, but how does your vehicle transmit the force from your foot to the wheels?

When you step on the brake pedal, you are actually pushing against a plunger in the master cylinder, which forces the hydraulic brake fluid through a series of tubes and hoses to the braking unit at each wheel.

The difference between drum and disc brakes

For drum brakes, the hydraulic brake fluid is forced into the wheel cylinder, which then pushes a set of brake shoes against the inner surface of a rotating brake drum. The rotating drum is connected to the wheel and friction causes it to slow down and stop.

For disc brakes, the hydraulic brake fluid flows into a piston, which presses an inboard pad against the rotor. At the same time, the caliper, which holds the piston and brake pads, presses the outboard pad against the rotor. The pads then squeeze the rotor, which is attached to the wheel, forcing your vehicle to slow down or stop.

Brake Maintenance

Brakes are a normal wear item for any vehicle and will eventually need replacing. Many factors affect brake wear, like driving habits, operating conditions and vehicle type.

When to book an appointment:

Brakes work by creating friction to slow and stop your vehicle. Every time you depress the brake pedal, the brake shoes or pads rub against the drums or discs, causing wear. So it's essential to have your brakes inspected regularly - usually every six months or 10,000 km.

Most disc brake pads have built-in wear indicators that make a high-pitched warning sound when the brake pads are worn and new pads are needed. This brake wear warning sound means that soon the brakes will not work well. Call to have your vehicle serviced. Continuing to drive with worn-out brake pads could result in a costly brake repair.

You may need to have your brakes inspected if:

  • You hear noises when applying pressure on the brake pedal
  • Your vehicle pulls to one side when braking
  • Your brake pedal feels different than normal or if you've noticed any change in the way your vehicle brakes
  • The parking brake doesn't work
  • The dash brake light or ABS light stays on

How To Choose

The majority of brake servicing falls into three categories depending on whether you have Disc Brakes or Drum Brakes:

  • Brake service
  • Replacement of brake pads/brake shoes
  • Replacement of brake pads & rotors or brake shoes and drums
Brake Service:

A typical brake service* includes the following:

  • General inspection of the front or rear brake system.
  • Cleaning or removing any debris or corrosion.
  • Lubricating the moving brake components.
  • Reassembling and road testing.
Replacement of Brake Pads/Brake Shoes:

This service typically* includes the following:

  • All of the brake service components.
  • PLUS
  • Replacing the brake pads or brake shoes.
  • Inspection of the master cylinder, brake lines and hoses.
  • Lateral run out inspection.
Replacement of Brake Pads/Brake Shoes & Brake Rotors/Brake Drums:

This service typically* includes the following:

  • All of the replacement of brake.
  • PLUS
  • Replacing the brake rotors/ replacing the brake drums.

*Excludes medium duty trucks and commercial vehicles.

Your vehicle was designed and tested with top-quality brake parts. When replacing parts of the braking system, be sure to get new approved GM replacement parts. If you do not, the brakes might not work properly.

Depending of which brake service your vehicle requires, your GM Goodwrench Dealer can offer a variety of different brake components to suit any budget from Original Equipment Brake Components to ACDelco Brake Components.

Your choices:

There are many different types of replacement brake components out in the marketplace. In fact, there are no mandatory standards for replacement brake parts. So, what do you need to know to make your decision?

Quality brake parts will perform better and provide greater customer satisfaction.

You get what you pay for and with brake replacement parts, this couldn't be more accurate. The best replacement parts money can buy are original equipment (OE) parts.

  • OE parts are designed specifically for each vehicle AND meet all Federal Motor Vehicle Safety Standards (FMVSS).
  • All OE replacement components carry a 12 month/ unlimited km warranty.
  • OE parts contain metallurgy specifically engineered for your specific vehicle.
  • OE parts tend to be the most expensive option.

If you don't want to pay a premium for Original Equipment brakes, then look for the D3EA® certification stamp on your replacement brake components.

D3EA® certification establishes brake component output performance consistent with Motor Vehicle Safety Standards braking requirements for new vehicles.

D3EA® measures both the front and rear braking system specific friction performance of brake shoes, pads, drums and rotors.

Product that achieve D3EA® certification and carry the D3EA® seal must be tested and re-qualified every two years.

Why go for ACDelco Brakes?

To start, ACDelco Brakes are D3EA® certified.

  • Safety first - ACDelco brakes are rigorously tested and meet Safety Standards.
  • ACDelco Brakes are designed to fit your vehicle whether it is made by GM or anyone else.
  • Uncompromising durability - ACDelco Brakes are corrosion-resistant and are built to maintain brake efficiency and improve front lining life.
  • Extra quiet - You won't hear much from these high-quality brakes.
  • Excellent warranty - Limited Lifetime on all Brakes Pads and Brake Shoes. 12 months unlimited kilometres on all other brake parts.

Your Tire Store

Welcome to the GM Goodwrench Tire Knowledge Centre, where you will find the information you need to make informed choices when it comes to replacing and maintaining your vehicle's tires.

When you're ready, an expert GM Goodwrench Service Consultant will help you find the tires that best suit your driving style and needs. GM Goodwrench offers the following tire brands at competitive prices:

  • BF Goodrich
  • Bridgestone
  • Continental
  • Dunlop
  • Firestone
  • General
  • Goodyear
  • Hankook
  • Michelin
  • Pirelli
  • Uniroyal

Tire Basics

Tires are made up of several different components*:

The Bead:A rubber-coated loop of high-strength steel cable that allows a tire to stay "seated" on a rim.

The Sidewall:Literally the "side wall" of the tire, this protects cord plies and features tire markings and information like tire size and type.

The Tread: This is where rubber meets road, providing strength, stability and above all else, traction to the road surface.

The Body: This is the tire itself, made up of several layers of plies. Plies, like polyester cord, run perpendicular to the tire's tread and are coated with rubber to help bond with other plies and belts to seal in air. Plies give tires strength and resistance to road damage.

Belts:Rubber coated layers of steel, fiberglass, rayon and other materials located between the tread and plies, criss-crossing at angles hold the plies in place. Belts provide resistance to punctures and help treads stay flat and in contact with the road.

The Inner Liner:This is the innermost layer of a tubeless tire that prevents air from penetrating through the tire.

Sipes:Sipes are special treads within the tread that improve traction on wet, dirty, sandy or snowy road surfaces.

Tire Maintenance

The key to prolonging the life of your tires is properly maintaining them. This means knowing when and how to look for problems.

Regular tire inspection is the best way to increase your vehicle's fuel efficiency, reduce harmful emissions, save money and most importantly, make your vehicle safer. It's also easy, here's how:

  • Check your tire pressure at least once a month with a good tire gauge.
  • If there is unusual tire wear, vehicle pull or vibration is noticed, have alignment and wheel balance checked.
  • Rotate your tires regularly.
  • Monitor treadwear and replace worn tires.
  • Visually scan tires whenever possible for foreign matter in the tread, or other objects that could cause leaks.

How To Choose

The GM TPC system makes it easier for you to select the right tires for your vehicle. An identical TPC code located on your new tire's sidewall indicates they meet the same critical performance specifications of GM vehicle original equipment tires.

You may also decide to replace your original tires with new tires that have different handling characteristics than those that came with your vehicle. Ask your GM Goodwrench dealer for help.

Tires are manufactured in a wide array of types and designs, and for every type of vehicle on the road. Getting the best combination of performance and value means understanding the options available to you.

It also means asking the right questions

  • What kind of vehicle do I drive?
  • What is my driving style?
  • Where and how will I use these tires?
  • What benefits do I expect from my new tires?

Tire Safety

General Motors has long been committed to keeping you and your passengers safer. In 1968, the GM Tire and Wheel Systems Laboratory was opened in Michigan, to oversee the design, development, validation and engineering release of all tires used on GM North American vehicles.

GM was also one of the first automakers to include original equipment tires in its new vehicle limited warranty. This means you can bring your tire concerns related to the tires on your GM vehicle directly to any GM dealer. In doing so, we can improve our product offering.

Another GM safety innovation is the TPC (Tire Performance Criteria) system, making it easier to purchase replacement tires for your GM vehicle. In General Motor's labs, tires in development for use on GM vehicles are subjected to a series of rigorous tests, under a variety of load and driving conditions. These tests measure critical performance characteristics, like force and moment properties that influence steering.

Basic Tire Safety

Tires are four of the most important features on any vehicle. They are also the area most often neglected even though they are relatively easy to care for. You can increase your vehicle's fuel efficiency, reduce harmful emissions, save money and make your vehicle safer by adopting a few simple tire maintenance habits:

  • Use the right tires for your vehicle and road conditions.
  • Check tire pressure on a monthly basis, using a good quality tire gauge.
  • Have your vehicle's tires aligned if you notice unusual wear.
  • Have your vehicle's tires balanced if you feel abnormal vibration.
  • Rotate your tires regularly.
  • Monitor tread wear and replace tires when tire tread is worn out.
  • Visually check treads for foreign objects and tires for rips and tears.
  • Properly store seasonal tires.
Tire Storage

Store seasonal tires upright, in an indoor location, out of direct sun or strong artificial light. Tires stored on the rims should be deflated to about 15 PSI (pounds per square inch) to avoid cracking or deformation.

Winter Tire Safety Tips

Living in Canada means dealing with cold, ice and snow, all of which can make for challenging driving conditions. The way your vehicle handles in these conditions can be greatly improved when the tires on all four of your vehicle's wheels are of the same type, size, speed rating and load index.

Winter Tires

Featuring a combination of specialized tread designs and compounds to provide effective traction in cold, snowy conditions, winter tires are the safest tires for Canadian winters. Marked with the pictograph of a peaked mountain with a snowflake, this symbol means your tires will meet the specific snow traction performance requirements - designed specifically for cold, snowy, icy and slippery driving. These tires are also designed for improved traction on cold, dry road surfaces.

Good Advice for Canadian Winter Drivers:
  • Install Four Winter Tires.
  • Do not mix tires: different tread patterns, size, construction can compromise vehicle performance and safety.
  • Check your tires: worn treads have less traction on all surfaces, especially on ice and snow.
  • Monitor tire pressure: in colder weather, the pressure in your tires drops. This affects safety and fuel consumption, so check your tires often.

The performance of your vehicle's tires is directly related to the temperature outside. As the temperature drops, even the best summer tires will fail to respond road conditions. All-season tires, while designed for all types of weather, will not perform as well in ice and cold.

As a rule, whenever the average outdoor temperature falls below or climbs above 7 degrees Celsius (19.4 degrees F), your tires will be affected. As the temperature drops, non-winter tires loose elasticity and the grip they have on the road. That's why the best tires to have when the temperature drops are winter tires. Conversely, winter tires will deteriorate faster in hotter temperatures.

All-Season Tires and Winter Driving

You can spot an all-season tire by the M+S (Mud + Snow) marking on the sidewall. All-season tires do provide safe all-weather performance. But remember, in severe winter snow conditions, they are not the safest choice.

Protecting Yourself and Your Tires

The life and performance of your tires depends on how, when and where they are put to use. The way you drive will directly affect the lifespan of your tires and above all else, your safety.

Safe Driving Tips:
  • Always observe the posted speed limit.
  • Avoid fast starts, stops and turns.
  • Avoid potholes and objects on the road.
  • Do not run over curbs.
  • Do not rub your tires against the curb when parking.
Flat Tires

Regardless of how safely you drive, there is always the possibility of getting a flat tire. If this happens on the highway, drive slowly to the safest area, out of traffic. Although this may potentially further damage the tire and wheel, it can also prevent serious injury.

Wiper Blades

When you have to wipe rain, dirt, sleet or snow from your vehicle's windshield, it's important to have the right wiper blades for the job. Wiper blades have come a long way since they first became standard issue on vehicles, so we invite you to learn more about these devices and how to properly maintain them.

Wiper Blade Basics

Visibility is fundamental to safe driving, which is why you should always make sure your vehicle's wipers provide you with the cleanest windshield possible.

Wiper Blade maintenance

You may need to replace your wiper blades if:
  • Your current blades leave streaks or miss sections of your windshield
  • Your current blades leave a haze on the windshield
  • You haven't replaced them in the past 12 months or don't recall ever replacing them
Follow these maintenance tips:
  • Inspect windshield wipers every six months for wear and damage, and change at least once a year.
  • Do not wait to replace worn and damaged wipers until the bad weather hits or visibility is so deteriorated that safety is compromised. Eyestrain from poor visibility can lead to driver fatigue and anxiety. A regular inspection schedule will help avoid potentially dangerous situations.
  • Give your wiper blade rubber elements a quick cleaning when filling up with gas. After the windshield has been cleaned using service center's washer solvent and squeegee, wipe down the rubber with a paper towel. Doing so removes any loose dirt and most road grime that can lead to streaking, smearing or hazing.
  • Use an ice scraper as much as possible when de-icing vehicles. Allow plenty of time to warm up the vehicle with the defroster on "high" to loosen as much ice and snow as possible. Do not use windshield wipers as ice scrapers.
Causes of wiper wear
  • Sun: ultraviolet light and ozone deterioration
  • Oil: car waxes and exhaust hold rubber-deteriorating oil
  • Airborne debris: sand, mud and dust carried in the wind
  • Moisture: Acid rain and salt water (in moist air both near the shore and inland)
  • Temperature: extreme cold and heat cause hardening and softening of the rubber element
Poor performance indicators
  • Streaking: blurry vision caused by dry or dirty rubber blades
  • Chattering: skipping of the blade caused by a permanent set or curve in the rubber of old blades
  • Lift-off: over time the arm tension deteriorates causing the blades to lift
  • Squealing: worn blade edges cause excessive friction and ultimately noise
  • Windshield scoring: in extreme cases, the wiper has deteriorated enough to cause windshield "scoring"
Inspecting your wiper blades
  • Flex rubber squeegee back and forth to see if it is still flexible. Aged squeegees will have difficulty conforming to the shape of your windshield and create streaks
  • Check squeegee wiping edge for rounded edges which can prevent the wiper blade from making strong contact with the windshield and reduces wipe equality
  • Tug to ensure wiper blade has been securely installed on the wiper arm
  • Check that squeegee is secure in the wiper frame
Did you know?
  • Wiper blades that are worn can cause excessive load on the wiper motor and linkage and lead to premature failure
  • If the blade is worn to the point where the metal frame can come into contact with the windshield at any point of rotation, then scratching/grooving can occur. In some cases windshield replacement would be the only fix.
  • If the blades do not clean well, the tendency is to use your washer fluid repeatedly until the windshield is clean. This generally causes excessive washer system and washer fluid use and could end up costing you as much as replacement blades or even more
  • Driver and passenger wiper blades are different sizes

Driving and Maintenance Tips

Here's some information your car or truck will thank you for with improved performance and mileage. You can also consult your owner's manual for even more helpful information.

Tire Pressure

To get a true tire pressure reading, check the tires when they're cold -- when your vehicle has been idle for at least three hours.

How Much Pressure?

A label on the underside of the trunk lid or on the edge of the driver's door will tell you the proper tire inflation for your car or truck.

Tire Inflation

Over-inflated tires wear out more quickly in the center of the tread. Under-inflated tires wear out more quickly at the outer edge of the tread. With under-inflated tires, rolling resistance is increased causing increased fuel consumption.

Oil Level

You'll get a more accurate dipstick reading if you wait a few minutes after turning off the engine. This gives the oil in the crankcase time to drain back into the oil pan. Also, make sure the vehicle is on level ground.

Fabric/Carpet Stains

Rub stubborn stains with a damp cloth moistened with club soda or glass cleaner. Also try denture cleaner dissolved according to directions on the package. It's a good idea to do a spot test to ensure that the colour of the fabric or carpet doesn't come out.

Hands on the Wheel

Always drive with both hands on the wheel. The best place for your hands are at the nine and three o'clock positions. This gives you greater steering control in all situations.

Quick Manoeuvring

If you need to turn the wheel suddenly to avoid hitting an object in the path of your vehicle, look in the direction you're turning. If you look at the object, you're more likely to hit it.

Lights On, Please!

In rainy or snowy weather, turn on your headlamps and tail lamps. Even if your visibility is good, other drivers will have a better view of your vehicle in their rearview mirrors.

Driving Out of a Skid, Backward and Forward

The best way to drive out of a skid is to take your foot off the accelerator, steer in the direction you want to go and constantly check for an escape route.


Driving with a lot of excess weight in the trunk of your car or truck bed can decrease gas mileage. Remove the things that accumulate in these areas.

Snow on the Roof

If you live in a snow belt, don't let snow pile up on top of your car or truck. Peaks of snow increase drag and decrease gas mileage. Also, don't let snow pile up in the bed of your pickup. It can cause an obstruction of your view and the view of other drivers.

Wash Wax Concentrate

Use GM Wash Wax concentrate (part number 10953196) as directed for a clean, shiny finish. It rinses off quickly and leaves no residue.

Figuring Out Your Mileage

Start out with a full tank of gas. Note the mileage on your odometer, or zero out your trip odometer. The next time you fill up, note how many litres of gas you've added and how many kilometres you've driven. Divide the number of litres added by the number of kilometres driven and multiply by 100. The resulting number is your vehicle's L/100 kilometres.

Engine Overheating

If your engine overheats in summer traffic, turn off the air conditioner and turn on the heater and fan to the highest level. It may be uncomfortable, but it will help cool down the engine.

Goodwrench Service FAQ

Here are some quick references to help you make your driving experience more enjoyable:

How do I know when I really need new tires?

You can't always tell by looking at the tread depth. Sometimes a tire that appears to have significant tread remaining needs to be replaced. So check the treadwear indicators -- bald spots that appear at various intervals on the tread. If you see them in three or more places, you need a new tire.

Also, you need a new tire if:

  • You can see cord or fabric showing through the tire's rubber
  • The tread or sidewall is cracked, cut, or snagged deep enough to show cord or fabric
  • The tire has a bump, bulge, or split
  • The tire has a puncture, cut or other damage that can't be repaired because of the size or location of the damage
Why can't I just use water in my radiator?

Your vehicle's coolant system is set for the proper coolant mix. With plain water, or the wrong mix, your engine could get too hot, but you wouldn't get the "overheated" warning. Your engine could be badly damaged and might even catch fire. Also, too much water in the mix can freeze and crack the engine, radiator, heater core and other parts. Damage resulting from using plain water or the wrong mixture would not be covered by your warranty. See your Owner's Manual for more specific information.

A 50/50 mixture of water and the proper coolant will

  • Give freezing protection down to -37° C (-34° F)
  • Give boiling protection up to 129° C (256° F)
  • Protect against rust and corrosion
  • Help maintain the proper engine temperature
  • Let the warning lights and gauges work as they should
Why do I have to keep changing the oil if I'm not burning any?

Oil helps protect your vehicle's engine from premature wear by suspending moisture, abrasive dirt, and contaminants until they're broken down by detergents and trapped by the oil filter. But over time, even the best oil loses its ability to do the job. That's why regular oil changes are so important. Even if you don't drive many miles, stop-and-go driving and repeated short trips can increase your vehicle's need for an oil change.

What's the best grade of oil?

Oils recommended for your GM vehicle (gasoline engine only) can be identified by looking for the "starburst" symbol, indicating that the oil has been certified by the American Petroleum Institute (API). Do not use any oil that does not carry this symbol. Check your Owner's Manual for the proper viscosity grade. Diesel engines have a different API symbol.

What is octane?

The octane number or octane rating is a measure of the anti-knock properties of gasoline -- a higher number indicates a smaller likelihood of knocking. Using a higher-octane fuel than your Owner's Manual calls for is a waste of money. It doesn't produce more power, performance or fuel savings. Follow the Owner's Manual recommendations regarding fuel octane for your vehicle. The only time that higher octane fuels might be necessary is if your vehicle suffers audible engine knock at highway speeds.

I don't smoke, so what's the film buildup on the inside of my windshield?

The film buildup occurs primarily as a result of harmless agents called plasticizers, which are released from the plastic interior parts and condense on glass surfaces. You can clean them off with GM Glass Cleaner, part number 992727.

When I'm waiting in my car with the engine running, how long of a wait justifies turning the engine off?

Restarting your vehicle's engine uses about as much gas as 30 seconds worth of idling. Therefore, shutting off your vehicle's engine when you'll be at a standstill for more than half a minute will improve your gas mileage and put fewer emissions in the air.

How come they never lubricate the lug nuts on my wheels? Wouldn't that make them easier to take off when I change a tire?

Lug nuts or studs should never be lubricated. While it may make them easier to remove, they could come off while you're driving. If you can't remove them with the equipment in your vehicle, call the GM Roadside Assistance line provided in your Owner's Manual.

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