Chevrolet Silverado 4500HD 2022 Owner's Manual page 338

336 Service and Maintenance
Footnotes Maintenance Schedule
Additional Required Services - Severe
(1) 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.
(2) Or every four years, whichever comes
first. If driving in dusty conditions, inspect
the filter at each oil change or more often
as needed.
(3) Or 2,500 hours or 24 months whichever
comes first. 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 0 278.
(5) Replace brake fluid every two years. See
Brake Fluid 0 286.
(6) Or every 12 months, or when the
CHANGE FUEL FILTER message in the Driver
Information Center (DIC) comes on,
whichever comes first. The fuel filter may
need to be replaced more often based on
biodiesel usage, driving in climates with
severe dust, off-road driving, or towing a
trailer for extended periods.
(7) U-bolts nuts should be re-torqued after
the first 1 600 km (1,000 mi) and then
approximately every 58 000 km (36,000 mi)
thereafter.
(8) Or every 12 months, whichever comes
first.
(9) Or every 12 months, whichever comes
first. See Wiper Blade Replacement 0 291.
(10) Replace air conditioning desiccant every
seven years.
(11) Or every 10 years, whichever comes
first. Inspect for fraying, excessive cracking,
or damage; replace, if needed.
Special Application Services
Vehicles with Dual Wheels: Check dual
wheel nut torque at 160, 1 600, and
10 000 km (100, 1,000, and 6,000 mi) of
driving. Repeat this service whenever a
tire/wheel is serviced or removed.
Have underbody flushing service
performed. See Underbody Maintenance
in Exterior Care 0 322.
At least annually, clean the exterior of
the cooling system.
Transmission fluid and filter may need to
be replaced periodically. Refer to the
Allison Automatic Transmission Manual
for specific service instructions and
recommendations, required capacities, and
transmission fluids.