alex1200 wrote:
My 2014 Ram manual said no break in period was required. HOWEVER, when you read the 700+ page owner's manual they say no towing for first 500 miles, then no faster than 50 MPH for first 500 towing miles. I took a road trip in mine to get my 500 miles. The manual says this allows all the components (rear end, transmission, etc.) to break in. It has nothing to do with the engine.
Page 122 of my manual references the Cummins break-in. It says due to construction no break-in period is required. I found the next few paragraphs interesting. "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."
"Because of construction of the Cummins turbocharged 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."
