1998 GMC Envoy Owner's Manual - Page 350

Part B: Owner Checks an - Services Listed below are owner checks and services which should be performed at the intervals specified to help ensure the safety, dependability and emission control performance of your vehicle. Be sure any necessary repairs are completedat once. Whenever any fluids or lubricants are added to your vehicle, make sure they are the proper ones, as shown in Part D. Engine Coolant Level Check Check the engine coolant level and add DEX-COOL' coolant mixture if necessary. See "Engine Coolant'' in the Index for further details. WindshieldWasherFluidLevelCl: -. Check the windshield washer fluid level in the windshield washer tank and add the proper fluid if necessary. See "Windshield Washer Fluid" in the Index for further details. At Each Fuel Fill At Least Once a Month Tire Inflation Check Make sure tires are inflated to the correct pressures. See "Tires" in the Index for further details. Engine Oil Level Check Check the engine oil level and add the proper oil if necessary. See "Engine Oil" in the Index for further details. Cassette Deck Service Clean cassette deck. Cleaningshould be done every SO hours of tape play. See "Audio Systems" in the Index for further details. 7-39