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Ultimately you want to find an oil the meets the "BMW LL-01" specification. In the US at least, Mobil 1 0w-40 and Castrol 0w-30 are what you usually will find. I believe they are both labeled "European Formula" or something to that effect. But your confirmation will be the BMW LL-01 spec listed on the back of the bottle.
I think BMW will top off for free if you bring it in.
Although, I personally couldn't imagine owning a car and not having top off fluids at home. (Oil, coolant, brake, etc.).
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