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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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