150 thousand is young for a diesel. If it were mine I would want to have a mechanic figure out what happened. I assume it is a NA 606. If so it should be just broken in good. I have heard of bearings falling out of the vacuum pump and dropping into the oil pump chain. I guess something like that could have happened. Since I have the same engine with 260 thousand on it, I would be interested in what happened.

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'97 E 300 D