1973 GTV, 1969 GTV, TR4 & 1969 Roadrunner (long gone), 1967 & 1969 Corvettes
Rosso Veloce;405206Would it be cheaper/better to keep using my Castrol and just add MMO? [/QUOTE said:Probably not IMO. MMO has a watery consistity which probably would dilute your 20w-50 down quite a bit. I think it's time to look at what exactly is in STP.