I've a 2010 x5m 45,000 miles, truck started smoking from the right rear muffler to the point where u can't see the truck, only at idle and initial startup, then the left rear, initially I thought it was the turbos, it turned out to be the crankcase vent, if u pull the air filter assy out u can c the turbo intake tubes, if the tubes r filled with oil it's the crankcase vents that r bad, I changed mines, n no more smoke, parts cost was $300,
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