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Barry M (not verified)    May 8, 2021 - 6:38PM

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What do u think about Guaranteed To Pass Emissions additive? When I ran it in my 97 4cyl Camry, I'd pull the plugs and all carbon was burnt off (clean). I own a gen4, should I be concerned ALSO?? I change MY oil every 5,000 or 6 mos whichever comes first.

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