2021 RAM 2500 Owner’s Manual — ENGINE BREAK-IN RECOMMENDATIONS — DIESEL ENGINE

The Cummins® Turbo Diesel engine does not require a break-in period due to its construction. Normal operation is allowed, providing the following recommendations are followed:

Warm up the engine before placing it under load.

Do not operate the engine at idle for prolonged periods.

Use the appropriate transmission gear to prevent engine lugging.

Observe vehicle oil pressure and tempera- ture indicators.

Check the coolant and oil levels frequently.

Vary throttle position at highway speeds 4

when carrying or towing significant weight.

Light duty operation such as light trailer towing or no load operation will extend the time before the engine is at full efficiency. Reduced fuel economy and power may be seen at this time.

For additional vehicle break-in requirements

page 241.

Because of the construction of the Cummins® Turbo Diesel engine, engine run-in is enhanced by loaded operating conditions which allow the engine parts to achieve final finish and fit during the first 6,000 miles (10,000 km).