First impulse when I looked at those was that the OM604, 605, and 606 are 4, 5, and 6 cylinder versions of the engine found in our American 96-99 E300D which came out in (95?). Our 606 was available in other countries as a 4 and 5 cyl as well. Possibly?

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL