Quote:
Originally Posted by Werner
Hello.
I am not sure if I have understood the core question correctly.
For vintage cars, a low viscosity can have the disadvantage that the shaft bearings leak leaking oil. Otherwise, a multi-grade oil is always better than a single range.
The most important is the API classification. Because of the non-ferrous metal compatibility. You should not go higher than "SC". Petrol engine oil API SC has anti-corrosion inhibitor, detergent cleaner, HD heavy duty additives. That is enough!
However, the oil still has to be changed many times (max. <1000 miles) because it runs without a filter and only then can the abrasion chips be taken out.
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that is very old world thinking. just like the guys who tell you to use non detergent oils . why? if your engine is in good shape and bearings and rings tight, lighter oil flows better, and protects better than heavy oils with less chance of burning