Sorry, na-Alzheimers.
15w-50 is too thick for my taste. It's slightly thinner than 20w-50 but then due to the temps, it'll feel more of the 50 anyways. The SL part is ok.
Usually 'energy conserving' oils are 5w-30 or 10w-30, so you can compare how thin that is to yours. This is probably the reason for your sluggish engine.





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