In my 190D 2.2, mercedes changed my oil last. It was almost immediately looking black on the dip stick. Is this just the nature of diesels? This is the first time I've changed the oil in this car, I haven't owned the car very long.

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1984 190D 2.2 Auto 220k
2001 Jeep Cherokee Sport 70K
2004 Lexus RX-330 ??K
2005 Chrylser Crossfire LTD 6K

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