RAM 2500 2021 Owner's Manual page 399

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Mileage or time passed (whichever comes first)
Or Years:
Or Kilometers:
Flush and replace the engine coolant at 10 years
or 150,000 miles (240,000 km) whichever comes
first.
Inspect the transfer case fluid, change for any of
the following: police, taxi, fleet, or frequent trailer
towing.
Change the transfer case fluid.
Inspect and replace PCV valve if necessary.
1. The spark plug change interval is mileage based only, yearly intervals do not apply.
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.
Failure to properly inspect and maintain your vehicle could result in a component malfunction and effect vehicle handling and performance. This
could cause an accident.
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WARNING!
SERVICING AND MAINTENANCE
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3500 2021

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