Thread: STP Oil Treatment Zinc Content
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Old 02-11-2019, 04:55 PM
Dragncar Dragncar is offline
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Join Date: Mar 2004
Location: Humbolt County California
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My dad used to break in cams with nothing but STP. I have always used EOS myself.
Valvoline VR-1 20-50, does it have a lot of zinc ?

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