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BMW is constantly updating their oil recommendations making the manual essentially "out of date". BMW recently revised most engines back to 2006 to prefer LL-01 FE oil at 0w-30 for all I6 gas engines instead of what most manuals at the time called for LL-01 5w-30.
The only difference is the minimum HTHS (high temp/high shear) spec. This determines how much viscosity is lost with high heat/stress. Higher is better. LL-01 HTHS minimum is 3.5 where FE is 3.0.
Summary: Someone at BMW came up with the idea that most of their I6 gas motors can get better gas mileage (higher CAFE rating) while sacrificing a little bit of viscosity. Probably wasn't an engineer that made that call...
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