BMW will say that's normal. They only become concerned if its more than 1
litre/1000 miles. Check around the front timing cover and the valve cover
for leaks. My M3 didn't leak any oil on the ground, but went through a
quart every 1200-1500 miles. It had a leak on the timing cover that was
very hard to see. If you are concerned about burning oil, have a leakdown
test done. It will show if you are getting oil past the rings.
As Kyle mentions, that's not out of line. Our '91 525i M50 uses
about the same at 150K - two dealers and two independents say
it's ok. Most likely cause, if no smoke and no carbon buildup in
tailpipe, is valve guides. Live with it - oil is cheap compared to
any kind of work on the head. If you are still worried, have a
compression and leak-down test done to eliminate valve seats
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