Actually, some manufacturers are claiming that with their tighter machining tolerances today they don't require a break-in period.
Cummins claims that if you pull the plunger from the injector from a new heavy-duty engines, draw a line around it with a dry erase marker, and try to put it together, you will fail. The ink from the marker will be thicker than the clearance.
Ring and pinions do wear into each other some. Basically they are smoothing out the contact areas. Unless they aren't set up properly. I've read in truck magazines that tires need to break in, too, that they can get better fuel mileage once they wear some.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather�s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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