so you got a usaa rebate thats Good past mines 3/20 expiring?
good advice. Sounds like the engines require zero breakin, but the gears/tranny do appreciate breakin for several hundred miles is what I’m gathering
Yes, I just got a USAA code 3/7/20. Actually, now that I looked again, I don't see any expiration on it. I was thinking of my pre-approved loan that was good for 45 days. The code sheet states the program is running Jan 3, 2020 through Jan 3, 2021. I've not done anything like this before but might fathom a guess they run them continuously.
Cummins engines do not require break in per se. They do get better mileage after ~6K miles as the engine wears into its "final finish." If you're not towing heavy, it will take longer. It's mostly for the gears, maybe the turbo to keep it out of high boost, though not 100% sure on the turbo.
From the OM:
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 temperature indicators.
Check the coolant and oil levels frequently.
Vary throttle position at highway speeds when carrying or towing significant weight.
NOTE:
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, refer to “Trailer Towing” in “Starting And Operating”
of the Owners Manual.
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).
CAUTION!
Do not tow a trailer at all during the first 500 miles (805 km) the new vehicle is
driven. The engine, axle or other parts could be damaged.
Then, during the first 500 miles (805 km)
that a trailer is towed, do not drive over 50 mph (80 km/h) and do not make starts
at full throttle. This helps the engine and other parts of the vehicle wear in at the
heavier loads.