I tow a travel trailer with my Cayenne Diesel. Oil temps seem to fluctuate greatly based on how hard I'm pushing it. Without towing I will see around 225F on the highway at 65mph. When towing I'll see 240F at 55MPH, 250F at 65MPH, and it will climb to 280F-290F+ when climbing long steep highway grades at speed. Currently using Mobil1 ESP which meets the C30 spec, but I'm wondering if there is a better oil to use that will handle the higher temps? Or are these temps acceptable with the M1?