Thanks for the suggestions . I have an oil cooler left over from the 16v engine which I could mount but the problem is the the m103 oil filter console (is that what of call it ? ) doesn't have the input and output for the oil lines to the cooler. The 16v console was them but it's not compatible with the m103 block, maybe a console from a m104 might do the job. However so far I haven't seen very high oil temp in this engine, usually it stays just below 100C degs and climbs to 110 when I drive it very hard.

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190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)