RAM Commercial CHASSIS CAB 3500 2021 Owner's Manual page 365

Mileage or time passed
(whichever comes first):
Or Months:
Or Kilometers:
Flush and replace engine
coolant. ***
1. Under no circumstances should oil change intervals exceed 15,000 miles (24,000 km) or 12 months or 500 Hours, whichever comes first.
2. Under no circumstances should the engine air cleaner filter exceed 30,000 miles (48,000 km) or 24 months, whichever comes first.
3. Inspect the front and rear axle surfaces every 20,000 miles (32,000 km). If gear oil leakage is suspected, check the fluid level. If using your vehicle for police, taxi, fleet, off-road or
frequent trailer towing change the axle fluid every 20,000 miles (32,000 km).
Inspection and service should also be performed
anytime a malfunction is observed or suspected.
Retain all receipts.
WARNING!
You can be badly injured working on or

around a motor vehicle. Do only service
work for which you have the knowledge and
the right equipment. If you have any doubt
about your ability to perform a service job,
take your vehicle to a competent mechanic.
6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
WARNING! (Continued)
Failure to properly inspect and maintain your

vehicle could result in a component malfunc-
tion and effect vehicle handling and perfor-
mance. This could cause an accident.
(Continued)
SERVICING AND MAINTENANCE
CAUTION!
***The manufacturer highly recommends that
all cooling system service, maintenance, and
repairs be performed by an authorized dealer.
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