you know the difference between w40 and w50 you sure does, So why to take chance.Always go for which is recommended,you can go for 05w50,10w50,15w50 instead if 20w50 but never go for w40 oil in a 220 engine.may be 5100 is not good for you but AFAIK,Motul is better but everyone has its own choice.






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