That's possible. My experience with oil-related problems with engines I assembled with STP was back in the late 1960's and early 70's before zinc additives in motor oil were an issue. Just to convince myself what I was experiencing was a fluke, I built one more engine (an air cooled Volkswagen) with STP and it had chronic low oil pressure. I sold the car to my brother, and he wrecked it before we got a chance to do an autopsy on the engine problem. Since then I've used a dedicated assembly lube.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!