I had my oil cooler replaced about a month and a half ago. My temps were always within 15 degrees of one another. One day when picking up and bringing a horse back about an hour away my temps steadily climbed to 50 degrees apart on the highway. Had the truck in the next day. Since the new oil cooler, temps driving around usually stay within 6-9 degrees apart empty. However, when towing on the highway temps stay anywhere from 16-22 degrees apart consistently (Seems a little high). Neither goes over 200 degrees though like when I had trouble with it. From what I've read, the temps I'm seeing now aren't normal. Is something going or just keep driving it?