Oil & coolant temps.
I've finally had a chance to put some freeway miles on my PSD. Heres the reason for my thread. My oil/coolant temps were an average of 10 to 14 degrees apart at 70 mph at 50 degree outside temp in full sun, oil at 187 to 197 and the coolant temp at 177 to 183 degrees, at 55 MPH I was 5 to 10 degrees apart. Sound like an oil cooler problem? Or is this acceptable with those outdoor temps, no load except me, the wife, three small dogs and two suit cases, any info would be too cool!