Do not even think of trying to turbocharge a normally-aspirated diesel engine. An MB turbo diesel engine has significant differences from a NA diesel. The pistons are lubricated and cooled from below by oil jets in the crankcase, and the injection pump has an ALDA that senses boost pressure from the turbo. However, I think some here have had success in adding an intercooler to an existing turbo, although I cannot speak to the performance gains, if any.

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Matt
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1995 E300 Diesel (Die Blau Frau)