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I suggest that you read this thread and the 2 below it. There has been exstensive testing on most brands of oil.
http://www.chevelles.com/forums/showthread.php?t=283416
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Sigh. If you guys want the real scoop on oils, with lab testing results, READ the link I posted. No guessing, no wives tales, no marketing hype, no "my brother-in-law said", just the facts, mam.