i also always add a full bottle of STP oil treatment.
I used to run regular castrol gtx oil of the same weight and i would notice it consumes more oil than if i use the high milleage stuff.
i too under very hard acceleration it will have all sorts of colors out of the back but i just keep checking the oil and maybe add 1-2 qts between 3K mile oil changes.
im not entirely sure if mines getting consumed or more likely leaking out everywhere...
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