I've read multiple threads that say the ECT and EOT difference should not exceed 15*. Mine is usually good but today I was towing about 5000# on a long steep on ramp getting onto the freeway. I was closely monitoring my temps and the EOT climbed to around 220* while the ECT stayed just below or at 200*. I was towing the short trip (10 miles) with the SCT set on the mild street tune. Is this cause for concern?
Is it alright for the differences in temps to widen for short periods of time (accelerating up a long on ramp), as long as they get back together after a short time, and normally stay close together on normal daily driving?
If the oil cooler is going bad, how much does it cost to repair/replace? Could this mean that there's something else wrong with my truck as well or is it a stand alone problem that could cause other things to go wrong?
Or am I worried about nothing since it only did it that one time and is usually within the normal range?