We recently made about a 3,000 mile trip towing our 32', 7,500 lb travel trailer. I love how this thing tows compared to our gas Chevy we traded on it. There's simply no comparison in ease of towing! The one thing I was a bit concerned about was the engine and oil temperatures it reached. On several long, uphill pulls in relatively hot weather (90's) we quite often got a warning that "Oil temperatures high, speed may be limited." I checked and the warning typically came on 265 deg. Once it got to that temp, it seemed to level off, not getting higher than 267 - only once did I see 268. Typically, I tried to keep the engine RPM's to less than 3,000 but was sometimes impossible. The engine temp reached max of about 235. Are these anything to be concerned about? The oil temp on level ground was typically in the mid 240's. I've read threads about possibly altering the grill to allow more airflow and thinking about that, but will that impact the oil temp? Oh, BTW, it does have the GDE tune. Thanks for any suggestions!