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Leon Cupra- oil viscosity classification - Ben {P}
Next week I shall have the oil changed in our Leon Cupra (02 plate with the AUQ engine) by our local Nissan dealership. They inform me they do not have any synthetic oil, so I will have to provide my own. Fair enough- but what is the optimum viscosity classification for this engine, 5w-30 or 5w-40?

Thanks.
Leon Cupra- oil viscosity classification - volvos60T5SE
oil viscosity is 5w-40.