If your car is not a Euro model, it certainly has some Euro components. With no a/c, it is almost certainly a Euro.
My '84 Euro 240D went 380,000 miles on the original engine with no oil cooler. Most all of these miles were in Texas, not exactly an arctic climate area.
If you were to stumble across an oil cooler and all the lines and the filter housing, it would be a worthwhile modification, but then you have to worry about an oil cooler line blowing and ruining the engine.
The oil cooler appears to be overkill.
Have a great day,