Recommend an oil for GX550

What oil and coolant temps are you seeing?
On a 20 mile commute on the highway at 70-75, coolant 177-188F and oil 180-190F. There's brief excursions up to 198F but seldom for prolonged time. The oil and coolant tend to be fairly aligned, but this makes sense as the truck has an oil cooler.
 
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