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The oil usage varies widely. There was one guy here who was having to fill oil at 1 liter per 800 miles, and after escalating to BMW he was told that this is normal - WTF!
I have owned two F10 M5s and my oil usage was one liter per 18,000 miles (no typo). This is prorated usage because I changed my oil before 18,000 miles but measured the oil before changes and also oil removed. Point is never had to add oil, two M5s in a row. I attribute my lack of oil usage to Alpine driving (I.e. Spending first 1200 miles on windy country roads, not taking highways, and observing break in rules). This said I know many of huge oil burners claim they did the same thing so maybe it doesn't make a difference.
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