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Q: oil disappearing. on 2002 BMW X5

no problem prior to oil change within few days ck engine light came on put in 3 quarts 3 days later 2 quarts last 3 days 1 quart/day. recently purchased took to mechanic no oil leak detected white smoke upon start up disappears after a few seconds. Anyone have any answers. driving less than 75 miles a day where is oil going no leak found on ground or detected by mechanic.(150k miles)
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My 2003 x5 has SAME problem.
SOLUTION: the oil filter was NOT tightened properly, and the oil was seeping there
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It is normal for an engine to require a little engine oil between services. For an engine to require excessive amounts of engine oil between services means the engine is either burning oil or leaking oil. Leaking oil should be pretty obvious, look for leaks underneath the engine at the oil filter, oil drain plug, and oil filter. Look for oil leaking from the timing belt cover area/timing chain cover and valve cover gasket. If an engine is "burning oil" look at the tail pipe and rear bumper for signs off discoloration or black oily deposits oil. Oil may leak down the valve guides particularly after the engine has been shut off and started from cold,if so blue oil smoke may be emitted from the tail pipe on start up, (this may also be noticeable if the car is left idle for a few minutes and then accelerated away for example after sitting at a traffic light). If the piston oil control rings are worn or "stuck" the engine normally smokes on acceleration. Oil control rings may fail due to an engine that has badly overheated or has had infrequent engine oil changes. Frequent oil changes with good quality oil is critical to long engine life. Perhaps changing oil viscocity to the next "thicker" grade would help.
My 2006 X5 4.4 has the exact same problem you describe. I was told the valve guide seals are worn and need replacing--to the tune of $9658! My dealer actually told me the car wasn't worth repairing and to trade it in. The car has just 64000 miles on it, but I'm reading this is a common problem after 60000 miles. Wish I'd been more savvy and bought the extended warranty when I had the chance.
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