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Hi all I posted a similar question a while back, and im curious as to what other people are experienceing when towing. Ive watched some Youtube videos and they seem to have of course conflicting indformantion. Bottom line, coolant temp is doing stellar, but alas, my oil temp when heading up hill is climbing a bit, I hit 278 today while driving through mountains. When cruising on the flats its about 260. I find the difference odd, the engine is staying cool, like below hall way in the temp gauge in fact, but oil temp is not. I try to keep RPMs below 200K. Whats normal? Whats acceptable for these engines? I have about 87,000 miles and 44% oil life. Using the suggested Rotella T6.
Thanks hope all are enjoying the summer.
 

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Late reply I know...but 278? In Oz we are in metric so = about 136c. I tow a 5700lb van with my diesel and the oil temp has hit as high as 110c (230F) on longer climbs, (higher the revs, higher the oil temp), but on the flat coolant usually sits around 94c (201F) with oil 10 degrees higher at 104c (220F) That's with ambient around 30c (86F).
 

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Hmmm, maybe, though I had the oil cooler fail on mine a few months ago...oil in the coolant! Temps did not give anything away at all...was all good. I have a Lufi reader attached to the OBD port all the time so can monitor all temps continually. Oil and coolant temps were fine that day, I was wheeling and thumped the front end a bit hard at one point, and I think that may have been what caused the cooler to fail in my case... it was the puddle of oil by the left front wheel in the morning that was the dead giveaway.

Maybe the oil temp sender unit is crook? Hard to gauge if oil temp is high of course without some probe, and if the sender is crook you'd get the same reading externally via the OBD port.

Maybe try the oil temp sender first as that is a whole lot simpler and cheaper than an oil cooler replacement to start with...
 
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