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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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