Can I use 20w50 oil as a top up to my 15w40 engine oil? - Quora
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Viscosity is essential in determining whether an engine oil is superior to the rest. These viscosities describe i… | Diesel oil, Performance engines, Cylinder liner
Can I use 20w50 oil as a top up to my 15w40 engine oil? - Quora
Can I use 20w50 oil as a top up to my 15w40 engine oil? - Quora
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Can I use 15W50 engine oil instead of 20w50 engine oil? - Quora
TheSamba.com :: Beetle - 1958-1967 - View topic - Oil Viscousity - is thicker better? 20W/60 vs 15W/40