Quote:
Originally Posted by tjts1
As far as I know, the om603 was the first aluminum head turbo diesel on the market from any manufacturer. Mercedes made some mistakes on this design which they later corrected.
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The early (1984?) 190D had an aluminum head (basically the same engine minus two cylinders). Also, the Mitsubishi 4D55 in 1983 had an aluminum head. Other countries might have gotten these engines in earlier year models as well.