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  1. ZDDP additive...

    smart General Discussion
    Look what I spotted in Maul-Mart... STP Synthetic, loaded with zinc dialkyldithiophosphate (ZDDP), an anti wear additive.. https://www.walmart.com/ip/STP-Synthetic-Oil-Treatment-15-oz/49850176 https://en.m.wikipedia.org/wiki/Zinc_dithiophosphate I may have to get a bottle to give it a try...
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