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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 38,252
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All consumer motor oil is a blend and has additives. The question is, do you want to mess with it?
What was STP? Simply a thickening agent on hand at all refineries to help blend oil to a specific grade. Then some cat bottled it. Go ahead, thicken your oil.
Or buy the next heaviest grade.
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