Found a stray vacuum hose under the dash yesterday.
Its black, and goes out into the engine compartment and connects to a "T" One side of the T goes into the white plastic thing at the end of hte fuel pump (ALDA?) the other hose continues up to the throttle linkage valves on top of the valve cover. Any idea where this belongs?

Also, can someone explain (briefly!) how oil gets into the vac. lines? I dont understand how a vacuum which should suck could do the reverse and pump oil through the system.

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Paul
2004 E500 4matic; 72,000mi