Thank you for those explanations, now it's clear in my mind !

I can also add that in Europe the 2.0D existed until 95. This engine was mounted in the first C class and during all the career of the W124.

In fact, it seems there are more differences than I thaught between the US and the Euro models, probably due to the stricter US laws in the pollution field.

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in France : 240D 1981 380 000 km
240D 1984 252 000 km
300D 1978 325 000 km
in the US : Ford Tempo 1993 70K