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Zmax is snake oil. They also make an additive for aviation recips called avblend and it's "FAA approved" (this not proof of efficacy, only that it will so no harm). If one were read the MSDS for either product, it would quickly become clear that both products consistof mineral oil and dye. I know pilots paying $20 bucks for this stuff at oil change. It's crap, find a good 0W-XX synthetic, and drive your car!
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