GMC 2011 Sierra Denali Owner's Manual page 448

11-4 Service and Maintenance
Body hinges and latches, key
lock cylinders, folding seat
hardware, and tailgate hinges,
linkage, and handle pivot points
lubrication. See Recommended
Fluids and Lubricants on
page 11 7. More frequent
lubrication may be required
when the vehicle is exposed
to a corrosive environment.
Applying silicone grease on
weatherstrips with a clean cloth
makes them last longer, seal
better, and not stick or squeak.
Restraint system component
check. See Safety System
Check on page 3 25.
Fuel system inspection for
damage or leaks.
Exhaust system and nearby heat
shields inspection for loose or
damaged components.
Additional Required Services
Every 12 000 km/7,500 Miles
Rotate tires. Tires should
be rotated every 12 000 km/
7,500 miles. See Tire Rotation
on page 10 62.
At Each Fuel Stop
Engine oil level check. See
Engine Oil on page 10 7.
Engine coolant level check. See
Engine Coolant on page 10 16.
Windshield washer fluid level
check. See Washer Fluid on
page 10 24.
Once a Month
Tire inflation pressures check.
See Tire Pressure on
page 10 54.
Tire wear inspection. See Tire
Inspection on page 10 61.
Sunroof track and seal
inspection, if equipped. See
Sunroof on page 2 20.
Once a Year
See Starter Switch Check on
page 10 29.
See Automatic Transmission
Shift Lock Control Function
Check on page 10 29.
See Ignition Transmission Lock
Check on page 10 29.
See Park Brake and P (Park)
Mechanism Check on
page 10 30.
Accelerator pedal check for
damage, high effort, or binding.
Replace if needed.
Underbody flushing service.