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According to the user's manual, that is a suitable oil spec for the 40i engine, but I'm not sure the 0-20w oil versus the 0-30w is the better choice for your area. The manual lists three LL specs that are suitable for the 40i (and 45e) engines, and both 0-20 and 0-30 weights. Don't know the specifics on this engine, but the lighter weight oil is often spec'ed for colder areas, but may be entirely suitable for this engine. SF certainly isn't like northern Minnesota , or Alaska, but it's also not the middle of the desert in Arizona, either. The later specifications may provide all of the protection at 0-20w as the 0-30w did on older specs while providing less drag in the engine.
The manual says that BMW now recommends Shell oils. For years, they used Castrol. Don't know why they changed.
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