Which 20w50 oil has the highest film strength?
Does 20w50 have higher film strength than 0w40?
Is 0w40 Mobil 1 safe to use in my 1980 Porsche 924 which calls for 20w50?
Does 20w50 have higher film strength than 0w40?
Is 0w40 Mobil 1 safe to use in my 1980 Porsche 924 which calls for 20w50?