The egines do come broken in( in a sense ). The problem is, the brakes, tires, drivetrain etc all need to be broken in aswell, under real conditions.
I am sure you would not like to go buy a brand new car, look at the tires and see they have wear on them? The only way the factory would be able to really break in the cars, is to drive them for a couple hundred miles. I personally would not like some ass getting stone chips all over my paintwork etc.
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