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Yikes.

I think it depends on how much power you are making and also on your water temp as well.

I am making 440 at the wheels.  My oil temps after a few laps can get up to 245F.  If I back out of it for a 1/2 lap it come down quickly.  My water temp never gets above 190F.  I have a an aftermarket radiator and vented hood.

I still have the stock oil to water heat exchanger above the oil filter. 

I also have a 13 row setrab oil cooler behind the passenger side vent.

I wish I could put a fan on the oil cooler but can't. 

I did cut the fender liner to allow for better airflow. this improved things a few deg.

I would be concerned with anything over 250F

I am measuring the oil temp at the same location.

Later,

Don