GMC Yukon Owner's Manual page 564

When the Change Engine Oil Soon message displays,
certain services, checks, and inspections are required.
The services described for Maintenance should be
performed at every engine oil change. The services
described for Maintenance
performed when:
Maintenance was performed the last time the
engine oil was changed.
It has been 10 months or more since the Change
Engine Oil Soon message has displayed or since
the last service.
Maintenance
Change engine oil and filter. See Engine Oil on
page 6 18. An Emission Control Service.
Engine coolant level check. See Engine Coolant
on page 6 32.
Windshield washer fluid level check.
See Windshield Washer Fluid on page 6 41.
Tire inflation check. See Inflation - Tire Pressure
on page 6 72.
Tire wear inspection. See Tire Inspection and
Rotation on page 6 78.
Rotate tires. See Tire Inspection and Rotation on
page 6 78.
7-4
should be
Fluids visual leak check (or every 12 months,
whichever occurs first). A leak in any system must
be repaired and the fluid level checked.
Engine air cleaner filter inspection (vehicles driven
in dusty conditions only). See Engine Air Cleaner/
Filter on page 6 22.
Brake system inspection (or every 12 months,
whichever occurs first).
Maintenance
Perform all services described in Maintenance .
Steering and suspension inspection. Visual
inspection for damaged, loose, or missing parts
or signs of wear.
Lubricate the front suspension, steering linkage,
and parking brake cable guides. Control arm
ball joints on 2500 series vehicles require
lubrication but should not be lubricated unless
their temperature is 12°C (10°F) or higher, or
they could be damaged. Control arm ball joints
on 1500 series vehicles are maintenance free.
Engine cooling system inspection. Visual
inspection of hoses, pipes, fittings, and clamps
and replacement, if needed.