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I will continue to use 10W-60 after the dealer installed it for my first service. It is simply the highest quality oil you could use and will protect the engine under all circumstances. Of course you can use whatever you want once you are out of warranty. All I have read about the TWS oil is that it is a very special oil that has been formulated and refined in its blend. These engines are in fact much different than the engines in the 50i. They have different pistons, a different oil pan, and different cylinder heads among the differences I have read about. They could in fact have different bearing clearances also, we have no way of knowing, without finding someone who can look in the factory engine specifications. Hopefully they will fix the ///M supplement manual so that it would spell it out for all of us once and for all.
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