Hi Switchblade -
Quote:
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Many people have observed that a modern engine will actually run for a surprisingly long time without oil anyway, so the demonstrations of engines treated with Product X and then drained of oil are less conclusive than you might think.
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I'd recommend a skeptical outlook, and reading this page:
Fuel saving gadgets - a professional engineer's view
Also:
Car maintenance bibles: Oil Additives
Slick 50 and other engine oil additives - The Skeptic's Dictionary - Skepdic.com