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Old 05-04-2011, 12:12 PM   #6 (permalink)
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Originally Posted by Kincurd View Post
I think anyone can agree that a purer, more refined petroleum-based motor oil, is better than a less pure oil; but the question is how much better, and how could it possibly let you go 25k miles between oil changes?
I think "purity" is a religious issue, and in fact a lot of the higher-quality (by service rating) oils are deliberately made impure with all sorts of additives.

As for going 25K miles between oil changes, anyone can do that. Just don't change the oil at the recommended interval.
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