I recently hooked up my PHP Gryphon FICM tuner. I didn't program a tune yet, because I wanted to get some baselines on my truck's PID readings first. Anyway, I took 'er for a spin today to check out EGT's, EOT, and ECT. My ECT's and EOT's were roughly withing a 15* delta of each other on flat ground at 55mph.
So, with that info, I can only assume that my oil cooler is becoming plugged.
If I were to do a full "highway drive" distilled water/restore/restore plus flush, would I be heavily risking plugging my oil cooler even more because of deposits elsewhere in the engine migrating to the oil cooler? While i know it's going to be time to change the oil cooler soon, I'm simply not in position to do that right now....but I need to tow my 10,000 lb RV about 1000 miles two weeks from now.
Any advice and info would be greatly appreciated.