Quote: 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.
I am not saying STP is bad, but remember that the oil in the STP bottle that carries the additives may not be the best oil. IMO, the ZDDP additives on the market now in smaller containers (4oz) are a better alternative.
