I wouldnt use 20w50 in my car. Its meant for cars with minor leaks. And 20w50 is probably the worst for a 7M. Its thicker, so it takes a longer time for the oil to get from the oil pan to the head. And thats the worst for this engine. The heaviest weight I would use is 10w30. Maybe 5w30 in the summer here because it's hot as hell. I'd use Mobil 1 because their guarantee is that if your engine has any problems related to an oil failure, ie. thrown bearing, they will buy you another engine. But I don't use Mobil 1 because I don't need to.
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