GMC Sierra 2500 HD2022 Owner's Manual page 397

396 Service and Maintenance
Maintenance Schedule Additional
Required Services - Severe
Rotate tires and perform Required Services. Check engine oil
level and oil life percentage. Change engine oil and filter,
if needed.
Check engine air filter life percentage and status. Change
engine air filter, if needed. (1)
Replace passenger compartment air filter. (2)
Replace spark plugs. Inspect spark plug wires and/or boots.
Change automatic transmission fluid and filter.
Change transfer case fluid, if equipped with 4WD. (3)
Drain and fill engine cooling system. (4)
Visually inspect accessory drive belts. (5)
Replace brake fluid. (6)
Replace windshield wiper blades. (7)
Replace hood gas struts and tailgate dampener. (8)
Replace air conditioning desiccant. (9)
Footnotes Maintenance Schedule
Additional Required Services - Severe
(1) Or every four years, whichever comes
first. If driving in dusty conditions, inspect
the filter at each oil change or more often
as needed. See Engine Air Cleaner/Filter
0 315.
(2) Or every two years, whichever comes
first. More frequent replacement may be
needed if the vehicle is driven in areas with
heavy traffic, poor air quality, areas with
high dust levels or are sensitive to
environmental allergens. Filter replacement
may also be needed if you notice reduced
airflow, windows fogging up, or odors. Your
local GM Service location can help you
determine when it is the right time to
replace your filter.