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[quote=Rosso Veloce;405206Would it be cheaper/better to keep using my Castrol and just add MMO? [/QUOTE]
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.
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1973 GTV - bought 3/06
1969 GTV, #AR1530021 - sold 10/72
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