GMC Envoy Service Questions

by Leonardo R. Grabkowski
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The GMC Envoy SUV was a truck-based SUV (body-on-frame) that shared most of its components with the Chevrolet TrailBlazer. The Envoy was manufactured from 2002 to 2009. During its production cycle, it was available in several different configurations, including an extended length model (the Envoy XL) and the unique Envoy XUV (with a rear cargo area that transformed into a truck bed). Following the proper service requirements can keep your Envoy running smoothly and efficiently.

How Often Should I Change My Oil?

All GMC Envoys are equipped with GM's Oil Life Monitoring System. This system notifies you when it's time for an oil change, based on climate and your typical driving habits (stop-and-go, highway travel, etc.). In a 2006 survey conducted by Valvoline and ASE (Automotive Service Excellence), 60 percent of mechanics recommended a 3,000 mile oil change interval. In most cases, the "Change Oil" light will illuminate around the 3,000 mileage interval. If you do not drive your Envoy regularly, the oil still requires changing at least once per year, regardless of mileage.

How Do I Maintain My Tires?

Your Envoy's tires should be rotated every 7,500 miles. Following this service interval will promote even tire wear (versus uneven wear, which can cause road noise, decrease tire life and reduce economy). In addition to rotation, your tire inflation level should be checked every two weeks. The precise inflation level depends on the model-year of your Envoy as well as the tire size. The tire and loading specification sheet is found against the glove box wall; it's also on the door jamb. Keeping your tires inflated to the recommended level increases tire life and improves fuel economy (up to 3 percent, according to the EPA).

Do I Need to Change the Timing Belt?

The GMC Envoy is not equipped with a timing belt--it is equipped with a timing chain. Timing chains do not have specific service intervals; they are designed to last the life of your vehicle. Nevertheless, like all parts, they can be subject to failure. At some point, the timing chain may require replacement, but this is unlikely.

When Should I Replace the Filters?

The engine air filter is designed to last approximately 50,000 miles; it should be replaced at this time. However, if you often drive in dusty conditions, the filter should be inspected after each oil change. Some Envoy models are equipped with an in-cabin air filter. This filter keeps particulates, such as pollen and spores, from entering your air conditioning vents. If your Envoy has an in-cabin air filter, it should be replaced every 15,000 to 20,000 miles. Your Envoy's fuel filter should be replaced every 30,000 miles. Over time, the filter can get clogged, which could cause hard starting, a rough idle or a reduction in engine power.

Does the Transmission Require Service?

The Envoy's transmission fluid requires replacement every 50,000 miles. The transmission filter should also be replaced at this time. It's advisable to check your transmission fluid level from time to time, particularly if you notice a fluid leak or experience rough shifting patterns while driving. If the fluid level is low, a leak is likely. Consider checking your transmission fluid level every few months to be safe.

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