What are other members are experiencing for engine oil temperatures at varying loads? I read a post that implied that there is a higher percentage of engine failures in EDs that are used more often for towing and hauling heavier loads. Could this indicate that the oil cooler is undersized for those conditions? I noticed yesterday that on a gentle climb of 700 feet elevation over 3 miles, my engine oil went from 209 deg to 213 deg and still rising while my coolant temperature held at 208 deg. That was with a totally unloaded truck. With oil breakdown temperature at 240 deg.......seems like very little margin. I will be watching closely but would really like to hear what others are experiencing......especially with loads. Also my engine oil pressure starts cold at approx 60 psi and idles after warm at 20 psi?