GMC Sierra 2500 HD2022 Owner's Manual page 396

Footnotes Maintenance Schedule
Additional Required Services - Normal
(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.
(3) Do not directly power wash the transfer
case and/or front/rear axle output seals.
High pressure water can overcome the seals
and contaminate the fluid. Contaminated
fluid will decrease the life of the transfer
case and/or drive axles and should be
replaced.
(4) Or every five years, whichever comes
first. See Cooling System 0 316.
(5) Or every 10 years, whichever comes first.
Inspect for fraying, excessive cracking,
or damage; replace, if needed.
Service and Maintenance
(6) Replace brake fluid every five years. See
Brake Fluid 0 323.
(7) Or every 12 months, whichever comes
first. See Wiper Blade Replacement 0 328.
(8) Or every 10 years, whichever comes first.
See Gas Strut(s) 0 329.
(9) Replace air conditioning desiccant every
seven years.
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