After doing some research I note that the final drive in the 190e 2.6 auto is the same as the 2.5D auto.
Would I be insane to convert my 2.6 to a 2.5D and use as a daily driver? If not, who might do it? I don't really feel like taking the job on myself.
The car is an interesting original Irish 2.6 Sportline with lowered suspension and cossie bits. I assume the 2.5 diesel weighs something similar to the 6 pot petrol, and the swap should be relatively straightforward and reversible.