hi .on my 120y(b210) i have mounted on the front off the water cooler radiator a oil cooler that i take from a lancia delta turbo.
i buy a "sandwich" to take the oil from the normal circuit to pass by the radiator.this "sandwich" is place betuin the oil filter and the oil pump.it cuts the passage from the oil pump and takes to the radiator and return to the filter and so on.
if i can ,a will take a picture off this assembly and put it tomorow or next time.
the oil runs more cooler and stay more clean and not burned or dark .i have monted this at 5 monthes ago and make more or less 2ooo kms and the oil is clean like new.