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    When redlined...

    What would cause a car to burn oil and smoke blue when revved to redline while sitting still? Also black and some slight white smoke is emitted as well. What is causing it?
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    What made Ford want to back specify oil weights?

    A good example would be the change from 5w30 in most vehicles, to 5w20 in nearly all of the new fords, excluding most of the EcoBoost engines and etc. Is 5w30 better, and is it true that 5w20 is only to meet CAFE standards? Wouldn't 5w20 protect an engine better, since it was designed for it...
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    2007 Nissan Xterra Oil Test

    How is it possible for my Xterra to wear this low? It was a surprisingly good result. No evidence of timing chain wear either, which was fairly common on these 4.0s. Any thoughts?
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