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The old standard STP was only PIB polymer. It gave the oil more viscosity so it reduced blowby and carbonized to help plug oil leaks. There is also a STP-4 which is the PIB and additives that help with wear and oxidation but not much more. It may make the oil higher in viscosity effecting low temperature properties, otherwise everything is good. I will have to pull up my database and check to see the ZDDP concentraion and see if it would hurt. Stand by...
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Michael D. Holloway
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