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Both Red line and Motul are ester based (added?) oils, they claim that the Ester based oils adhere to metal parts better than other synthetics, is there any truth in that?

Okay, I read the motor oil 101, here is my question BMW recommends a 5W30 API SM, Motul on their Website recommends a 5W40. Given everything I read in the Motor oil 101 the 5W30 should be the better oil to use. I would think Motul was smart enough, why would they recommend a 5W 40??

i have a 2009 BMW 750Li. at 7500 miles i switched to red line oil, no problem, at 15000 I replaced the oil, and I got a fault from my oil level sensor, when the dealer put it on the computer it said there was moisture in my oil. dealer assumed it was a bad sensor, replaced it twice. finally he...