2003 GMC Sierra 1500 Pickup Owner's Manual - Page 504

Scheduled Maintenance The services shown in this schedule up to 100,000 miles (166 000 km) should be repeated after 100,000 miles (166 000 km) at the same intervals for the life of this vehicle. The services shown at 150,000 miles (240 000 km) and 200,000 miles (332 000 km) should be repeated atthe same interval after 150,000 miles (240 000 km) and 200,000 miles (332 000 km) for the life of this vehicle. See Part B: Owner Checks and Services on page 6-1 1 and Part C: Periodic Maintenance Inspections on page 6-16. Engine Oil and Chassis Lubrication Scheduled Maintenance Change engine oil and filter as indicated by the GM Oil Life SystemTM every 12 months, whichever (or occurs first). Reset the system. Your vehicle has a computer system that lets you know when to change the engine oil and filter. This is based on engine revolutions and engine temperature, and not on mileage. Based on driving conditions, the mileage at which an oil change will be indicated can vary considerably. For the oil life system to work properly, you must reset the system every time the oil is changed. When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. A CHANGE ENGINE OIL message will come on. Change your oil as soon as possible within the next two times you stop for fuel. It is possible that, if you are driving under the best conditions, the oil life system may not indicate that an oil change is necessary for over a year. However, your engine oil and filter must be changed at least once a year and at this time the system must be reset. It is also important to check your oil regularly and keep it at the proper level. Footnotes The U.S. Environmental Protection Agency or the California Air Resources Board has determined that the failure to perform this maintenance item not nullify will the emission warranty or limit recall liability prior to the completion of the vehicle 's useful life. We, however, urge that all recommended maintenance services be performed at the indicated intervals and the maintenance be recorded. t + A good time to check your brakes is during tire rotation. See Brake System Inspection on page 6- 17. 6-5