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I'm just curious, what would be a "normal engine oil temp" and EOT under sustained load. During my last camping trip I noticed EOT was 209 wile under load and 197~ unloaded. My coolant "idiot" gauge on the dash never moved.
Your EOT observation is right in line with where I would expect to see an efficient cooling system. I would like to offer a couple of quick links for your reading and viewing enjoyment...
Keep in mind...your oil cooler is an oil cooler and your oil is cooled by coolant. Accordingly, your oil temp would have to be higher than your coolant temp.
Thanks for the info! My EOT under load was was a type-o it should have read 219 not 209. Also forgot to mention that ambient temp was about 102 when I saw these readings. I was just curious because I have never monitored my EOT till recently, and never had an actual temp gauge on my coolant system. I have hauled some fairly heavy loads and never seen any difference in coolant temp on the idiot gauge. I'm not an oil expert but I deal with large turbines and lube oil systems at work. We usually don't worry much about bearing and seal damage till around 275*F. I figured trucks weren't much different. I guess I was just wondering what the range of "normal" for a healthy cooling system looks like.
Keep in mind please... The with the exception of the transmission cooler, the entire 7.3 Power Stroke cooling system is seriously robust and very capable of its job if properly maintained.
215-220 is an everyday thing here in Texas for oil temp running empty.
Most conventional oil can run 250 all day long without issues to the oil. You need to be above 200 anyway for the contaminates to burn out for at least an hour, longer is better. Synthetic oil is all over the place when it comes to temperature depending on blends and base stocks, however usually between 450 to about 700 or more, please do not run oil that hot.... Your coolant temperature would be uncontrollable at that point anyway. Keep an eye on a proper coolant gauge and a real oil temperature gauge.
When done driving (loaded especially) let the engine idle for a few minutes before shutting down, protects the turbo and cools the entire cooling system some.
