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Originally Posted by RandallNeighbour
While keeping our engines above 4k does keep carbon from building up, it does wear the engine out sooner too. Brucelee stated this elsewhere on the forum a while back when asked this same question. Good logic.
I don't keep my motor above 4k at all times, that's for sure. But I do run it up to redline most every time I drive it though to blow out any cobwebs that might have accumulated in the car between drives  |
I read an SAE paper a while ago that measured engine wear by oil analysis if metal particulate. They found that engine wear was not, in fact, related to engine speed at all. It was directly related to load. The higher the engine load, the higher the wear.
Particulate count was consistent no matter what the RPM of the engine for a given load, essentially stating the higher the RPM, they found the lower the wear per stroke.