Quote:
Originally Posted by Whoopsy
In the simplest term, yes.
The engine is going to waste energy pushing through the thicker 60 weight oil, so it will make less than those engines using 30 weight.
Also on cold starts, the 10w weight oil is going to circulate slower than the lighter 5w weight oil so there will be more wear and tear for the initial few seconds after cold start.
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So you would want to use Mobile One's 0W-20 then....it will circulate super fast on warm up. Obviously it's not that simple and and does not work like that. Many engineering factors goes into what weight of oil is used in a motor. It's just not that simples as molasse dripping down the side of the tree. Just bearing (main) clearences alone will be enough to change the weight of the oil used. I don't have any prove, but I am pretty sure the bearing clearences between the M and the regular 50i is different just because there is a big difference in load. The two motors may have the same root, but after all the design changes, they are essentially different, very different in engineering terms. Not saying that fact alone will dictate the use of TWS. Again, please go to the dealer and have them pull it up on the screen. I will not beleive what the dealer "say" or "tell" you by mouth. I went to a BMW parts department and asked what oil I should use for my x6M. His immidiate reaction was the 10W-30. Then he said he better double check. He looked it up on the system and it shows the TWS. Ask the dealer to show you on the screen period. See it for your self.