Quote:
Originally Posted by JamesGames
..... Common sense says it doesn't, and according to BMWs original oil choice graph the heavier weighted oil does protect better. Keep in mind oils with a bigger range such at 0w40 will create more carbon buildup on the valves / blow by than let's say 0w30FE or 5w30....
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This is the basic conclusion I came to which is why I chose to stick with the 0W-40 and not go with the FE oil. Regarding the extra carbon buildup/blowby piece, I had not heard that before. But then I have an oil catch can installed and do oil changes every 5k miles so I think I am covered there pretty well.