GMC 2.8L Duramax Diesel 2020 Manual page 92

Maintenance Schedule
Additional Required
Services - Normal
Perform Required Services. Check engine oil
level and oil life percentage. Change engine oil
and filter, if needed.
Replace engine air cleaner filter. (1)
Drain and fill engine cooling system. (2)
Visually inspect accessory drive belts. (3)
Replace timing belt.
Replace fuel filter. (Pickup) (4)
Replace fuel filter. (Van) (4)
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 72.
(2) Or every five years, whichever
comes first. See Cooling System
0 74.
(3) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.
(4) Or every two years, or when the
CHANGE FUEL FILTER message in
the Driver Information Center (DIC)
comes on, whichever comes first.
Service and Maintenance
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.
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