Yes, I'm aware of all that an agree 100%. Some people however choose to not believe such things. And, get angry when anybody dare mentions them. Maybe now the angry-guy can start calling you childish names instead of me. Gets tiring and can ruin an otherwise good posting.
With heavy duty engines however, many companies advise a slight break-in period since they are built to be used hard and steady - unlike passenger vehicles. When we sold new tractors, we would not let them leave the dealerhip until we ran on a dyno for a full day with mixed loads. I can't say what we did helped or not, but can say we tried -and followed Deere's orders. We were afraid either somebody would take home a brand new tractor and stick it on a PTO full-load - or bring it home and baby it too much. Who knows? Maybe that would of been better? Deere told us to use mixed loads at first, and not steady.
Back around 1968, I bought a factory-rebuilt 389 engine for my 1965 GTO. That thing smoked something awful for a long time. Very long break-in period - I assume because it was so sloppily machined and put together. I doubt anybody could get away with selling stuff like that anymore. That was the last and only rebuilt engine I ever bought. I now do myself, or just buy a good used engine that nobody's been into.
With John Deere . . . their engines reached a quality-control low-point with the 40 series ag. tractors and C series crawlers. After that there was a big shake-up and Deere engines got put together much better.
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