[Kube]

Please stop using STP. It will cause more harm than good. Consider it "snake oil".

I'd personally rebuilt NUMEROUS engines in the past decades. It was always easy to tell what clients used STP by the amount of GUNK in the engine galley.
It (STP) held many "garbage" particles in place. In other words, the poopy never got to the filter.
If you are looking to quiet down an engine to sell to some unsuspecting person, use it. If you're looking to increase oil pressure temporarily, perhaps to fool some unsuspecting person, use it. Otherwise, stay far away...