Thank you for your reply.
Regarding the topic of thermostatic oil cooler. I'm having issues with over cooling using a thermostat. It might be related to the fact that the radiator I use is a big 30 row cooler. It results in the oil pan temperature being very low at between 40 and 60 C. I think that is not good because of the viscosity of the oil being too high at this temperature (also it might be a problem to burn off water ect).
Also the oil lines are rather large to keep pressure drop low.
So I was wondering if it would be a better solution to mount two fittings to the oil pan and fit an external electric oil pump and a big cooler and then use PWM to control the speed of the pump to keep the oil pan temperatures low but not too low. Then I could also use smaller 6 or 8 an lines.
The pumps I can find flow around 3-4 gallons pr minute if they are supposed to stand continuous use at high temperatures. Would that be enough? And what would be optimal oil pan temperatures? 85 C ?
Oh, and I should add that I would leave the OEM cooler in place.