Hi,
My 2011 X5 5.0 N63 engine, consumes 1 quart oil per 1000km / 600 mile. Previous owner already changed valves. No smoking at all. Changed vent pipes , upper ones. Thinking to replace oil separators.
What you think , can damaged oil separator consume such amount of oil.
How van I diagnose oil separator??
Next step is to use some clogged ring and engine cleaner.
Any input ..

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BMW 2011 5.0i (currents)
BMW 2004 4.4i (retired)
BMW 2001 3.0i (retired)