For time and/or mileage intervals of scheduled maintenance items, refer to
Scheduled Maintenance
.
The following text and illustrations describe the details of the required scheduled maintenance services.
For information on the proper fluids and lubricants to use, refer to
Fluid and Lubricant Recommendations
.
Engine Oil and Filter Change
For the engine oil and filter changing procedure, refer to
Engine Oil and Oil Filter Replacement
in Engine Mechanical.
For information on the correct engine oil quality and viscosity, refer to the following:
Gas Engine Oil Quality
Oils of the proper quality for the vehicle can be identified by looking for the STARBURST symbol. The STARBURST symbol indicates that the oil has been certified by the American Petroleum Institute (API), and is preferred for use in gasoline engines.
Engine Oil Viscosity
The recommended oil viscosity is SAE 5W-30.
Engine oil viscosity, or thickness, has an effect on the fuel economy and on the cold-weather operation, such as starting and oil flow. Lower viscosity engine oils can provide better fuel economy and cold-weather performance. However, higher temperature
weather conditions require higher viscosity engine oils for satisfactory lubrication. When the temperature is consistently above -18°C (0°F), use SAE 10W-30. SAE 20W-50 or oils of other viscosity rating or quality designations are NOT recommended
for use in any trucks at any time.
Diesel Engine Oil Quality
Notice: Use only engine oils that have one of these designations,
CI-4 or CH-4, for the Duramax® diesel engine. Failure to use the recommended
oils can result in engine damage not covered by your warranty.
This doughnut-shaped logo (symbol) is used on most oil containers to help you select the correct oil. It means that the oil has been certified by the American Petroleum Institute. You should look for this on the oil container, and use ONLY
those oils that display this logo. GM Goodwrench® oil of the recommended viscosity grades meets all the requirements for your vehicle.
Diesel Engine Oil Viscosity
The recommended oil viscosity is SAE 15W-40.
Notice: Using oils of any viscosity other than those recommended
could result in engine damage. When choosing an oil, consider the range of
temperatures the vehicle will be operated in before the next oil change.
Then, select the recommended oil viscosity.
Important: However, you can use SAE 10W-30 if temperatures stay above -18°C (0°F) before your next oil change. When it is very cold, below -18°C (0°F), you should use SAE 5W-30 to improve cold starting
and prevent engine damage.
These numbers on the oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 10W-40 or SAE 20W-50.
Chassis Lubrication
Notice: Do not lubricate the parking brake cables. Lubrication destroys the
plastic coating on the cable.
Refer to the illustration for the location of the lubrication points for the chassis. Lubricate the transmission shift linkage. Lubricate the park brake guides, the underbody contact points and the linkage.
Lubrication Points (4WD)
