ajshanny, best bet is to buy a bottle from BMW dealer - as has been discussed above, they will not sell anything that is bad for your engine.
Switching to another brand/type is a bit risky, even if that risk is limited, but so is also your economic gain compared to enginebreakdown.
Engine oil is a lucrative business - I caught my local Shell mechanic filling oil from a barrel into a "Premium" Shell quart bottle. Have not used him since.
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