GMC Sierra Instruction Manual page 456

Service and Maintenance 455
Maintenance Schedule
Additional Required
Services - Normal
Rotate tires and perform Required Services.
Check engine oil level and oil life percentage.
Change engine oil and filter, if needed.
Replace passenger compartment air filter. (1)
Inspect evaporative control system. (2)
Replace engine air cleaner filter. (3)
Replace spark plugs. Inspect spark plug wires.
For GVW under 8600 lbs, change transfer case
fluid, if equipped with 4WD. (4)
For GVW over 8600 lbs, change transfer case
fluid, if equipped with 4WD. (4)
Drain and fill engine cooling system. (5)
Visually inspect accessory drive belts. (6)
Replace brake fluid. (7)
I n f o r ma t i o n P r o v i d e d b y :