Special Application Services; Special Application - GMC CHEVROLET Silverado 6500HD 2019 Owner's Manual

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) 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
0 301.
(5) Replace brake fluid every
two years. See Brake Fluid 0 311.
(6) Or every two years, 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 0 316.
Service and Maintenance

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
0 351.
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.
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