Originally Posted By 70AARcuda
Any oil with zinc in it, had the zinc additive put in it...

been using the zddp additive for many years...I add the 4 oz bottle into the one gallon jug of oil...shake it....done..


Adding it after the product is finished is different than adding it during the manufacturing process.

Why would anyone run an oil they have to buy a $4-$10 addative for, when they could buy an oil that already has it?

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