I'm not sure it does. But I am pretty sure that 5w30 is what BMW recommends. Of course, they also recommend changing the oil at 15-17k miles. I never liked the higher viscosity over 7 years with my other X5. It was always thicker at changes- even at 5k miles. This engine is so prone to sludge that I wanted as much flow as possible- even on short trips. When I do choose to go into the office, it's only a mile away. I also use it on my SC'ed 540. Relatively narrow and a little weird passages to get to the SC.

But really, weight of oil is a lot like the brand of oil people choose. The simple key is to change your oil at reasonable time intervals for the oil you do choose. Though many treat it as if it's the most critical decision you can make, the brand or weight you use is about 10% of the equation.

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