Not sure if this has been discussed yet, I've been looking around and haven't found anything. My 6.7 holds about a 15* delta between oil and water temp when on the freeway and about 18-20* when towing on the freeway. 185* water 204-207 oil. Sound normal? I haven't really seen a guideline as to deltas with our trucks, since everything is water cooled. What do you have?