Additional Required Services (Gasoline Engine)
This maintenance section applies to vehicles with a gasoline engine. If your vehicle has a diesel engine,
see the maintenance schedule section in the DURAMAX
®
Diesel Engine Supplement.
The following services should be performed at the first maintenance service (I or II) after the indicated
miles (kilometers) shown for each item.
Additional Required Services
Service and Miles (Kilometers)
25,000
(40 000)
50,000
(80 000)
75,000
(120 000)
100,000
(160 000)
125,000
(200 000)
150,000
(240 000)
Inspect fuel system for damage or
leaks.
• •••••
Inspect exhaust system for loose or
damaged components.
• •••••
Vehicles without a filter restriction
indicator: Replace engine air cleaner
filter. See Engine Air Cleaner/Filter
(Gasoline Engines) on page 491.
•••
Allison Transmission
®
only: Change
automatic transmission fluid and
external transmission filter (severe
service). See footnote (m).
• •••••
Allison Transmission
®
only: Change
automatic transmission fluid and
external transmission filter (normal
service).
•••
622
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