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Every 5K for me...AND, I am changing weight during Summer to 5-30, back to 0-20 for Winter. I'll end up having a climate change (LOL) standard than a mileage standard as I don't drive that much.
However, to answer your question...5K, IMO.
I just pulled out the factory oil at my first 5000-mile change and less than 5L came out! Other sources say over 5L, specifically 5.2L to 5.3L. Is BMW that cheap, or did my B48 burn off that much oil???
She's topped off now.
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