After 2015 BMW started recommending Shell Pure Plus Synthetic Oil. I think any good quality synthetic motor oil in the correct weight would be fine for something like this. I had to add a quart every few months when I had an M5, only one quart in 4 years is pretty good.
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2014 X6M (daily)
2015 S63 AMG (beach car)
2017 Alpina B7 (Wife)
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