Have you checked your oil level lately? If it is burning oil from a bad head gasket it can go through oil very quickly. I'd check it before starting the engine tomorrow, just in case.

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1979 240D, 4spd manual, Power Sunroof, manual windows, 147k miles, Pastel gray/Black MB Tex.
1991 300D 2.5 - Smokes like it's on Crack!