Oh dear.
We have had cars in trouble with overheating oil and it transpires that they all have removed the excellent Modine and replaced it with an old fashioned oil radiator.
Let me explain a number of things. The Modine is a very compact heat exchanger, it is the tiny box in the middle of the photo. It has engine water passing through it and engine oil, so when it is cold the Modine warms the oil with the coolant water and when it is hot it cools the oil. In our experience the oil never deviates by more than 15°C from the temperature of the water.
The car that we have taken this old fashioned oil radiator from had the system plumbed the wrong way such that the oil wasn’t filling the cooler and I fear for the bearing shells in the engine.
With the race cars I always ask the owners to really warm them up before going out on track, ideally they should be warmed up until the fan kicks in, which is at 96°C, that way the engine oil will be at something like 80°C and good to do it’s job. Don’t worry if your oil temperature gets high, my experience is that synthetic oil will be fine up to 180°C, but then put it through the turbo and it gets burnt.
How often do I have to say that the Fiat Group spend millions on development to make sure that their cars are reliable, so if it works leave it alone.