Oil getting too hot

96 pete 378 3406e 475hp

My oil has been usually running at 210-220.

This past week its been almost to 250* which us getting to hot. Just did an oil change yesterday too thinking it might help with no luck. My oil psi runs about 54-56.

Wgt may be causung this and what do i need to replace here to get this under control?

 

Not sure if matters but i put a brand new sensor on the oil pan in April.

 

I have a temp gun ill have to grab from home.
Water temp is pretty good holding at 190-200*. Fan kicks on around 205*

Has round oil cooler on passwnger side of motor. Afraid it might be the issue

 

Its abot 70* currently. Very nice out. Empty at 35000lbs running 60mph

 

not at all. But thats why i also run at 60-65mph. I have 4.65 gears so pst 65mph shes pretty high up there in rpm's. But like i said its just this past week that it has gotten this hot. Usually runs at 220*. My concern is the oil breaking down because at 240* oil starts to break down