Valve stem seals. Intake leak where it's sucking oil in from the valley. Bad PCV system that's also sucking in oil from the crank case. Head gasket possibly. I doubt it's oil that's coming out of the tail pipe. I would suspect condensate mixed with carbon build up but I could be wrong. Does the engine use oil or anti freeze? Have you pulled spark plugs to see if you can pin point a particular cylinder that's not burning cleanly? What color is the smoke? Does it have a particular smell that's "odd"?
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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