Is the only part moving and doing work on your truck the engine? No wheel bearings? No ring and pinions? No transfer case? No driveshafts? No transmission? No wheel bearings? No brake calipers? Must be a very special truck you've got there.
I didn't say there is NO break-in period. I did say that with most companies using modern equipment, break-in time is MUCH shorter for engines because machining has greatly improved over the years.
About your Dodge truck. Do you really believe that the only component on your truck that had to break in was the engine? When your truck is moving, there are many other parts turning, e.g. axle gears, transmission gears, etc. There are many parts that might break-in a bit and turn easier.
If your Cummins engine got a 4 MPG improvement in 20,000 miles due to the engine alone - it sounds like it was put together pretty poorly - which I doubt.
About your degergent oil comments. Please explain to me what degergent additives in engine oil have to do with a prolonged break-in period? I think you've got anti-wear addtives (like boron, zinc, and phosphorus) confused with degergent additives.
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