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One bottle of STP treats 5 qts. of oil. My system, 7 Qt. pan, windage tray =1 more qt. and an
HP oil filter = 1 more qt. That's 9 qts, and I just add another bottle for GP's. You can't have too much zinc.




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As a matter of fact, you CAN also have too much zinc in the motor oil. Too much zinc increases the formation of sludge and pitting of metal surfaces.




Not trying to start an argument here, but 2 things come to mind.
1. Why did the other bearings, rods and mains, look like new?
2. There ain't no sludge in my engine, or pitting, for that matter.

Thanks for your input though!



I am not going either to start arguing here clear issues, but someone stated here that you can't have too much zinc in motor oil. That is NOT the truth and it has been a very long time well known issue among people who are working with the R&D of lubricants.

Like said, your bearing failure may not have been a direct result of overdosing STP, but statements here won't renew the basics of science like chemistry and tribology. Too much zinc in the oil causes problems. Period

This is the end of this discussion from my side.