Quote:
Originally posted by OffroadX:
The reason they want you to vary the engine speed and to coast etc. is to vary the vacuum in the system to help pull oil up into the rings and such. It's good advice.

Brent
What about supercharged engines? The system isn't always under vacuum, but positive pressure. How does oil get up to the rings and such then? I think they want to you to vary speed so that you don't wear grooves in whatever parts breaking in. They'll wear-in more evenly? What do you think?
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-Bryan