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Think of it this way, is there more friction with steel on steel components at slow speed or high speed? Think about pushing something heavy with no wheels across the ground. The hardest part is getting it started and then the more you get it moving the easier it slides. Pistons somewhat work the same way. You dont want to ever bog the engine, puts more stress on parts than high revs. When you first start the car for the day shift between 3,000 and 4,000 rpms until its warm and the oil temp starts climbing, then start shifting at 4,000 + . Its fairly well known that the M96 and M97 motors seem to do better if they've been driven at 3,000 and above RPM's. Cars that have been mildly driven seem to have more problems oddly enough.
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