OIL COOLER
Fleet Owner
Joined: Nov 2003
Posts: 27,900
Likes: 3,617
Never argued this with me 
to a degree delt still matters IMHO but ymmv.
the key with delt is a high spread can cause an oil cooler to rupture and leak oil in to the cooling system.
If you go back threw tsb 09-08-03 you will find refreance to high delta causing
as well. I have never seen that happen but if you can get it above the boiling temp it is possible to do.
to a degree delt still matters IMHO but ymmv.
the key with delt is a high spread can cause an oil cooler to rupture and leak oil in to the cooling system.
If you go back threw tsb 09-08-03 you will find refreance to high delta causing
as well. I have never seen that happen but if you can get it above the boiling temp it is possible to do.HOWEVER - I will say that the TSB never intended to be written for folks w/ an EGR delete (or even a bulletproof EGR cooler IMO). I do see how you might be able to get the coolant above boiling when you have a bulletproof EGR cooler, but certainly not an EGR delete. IMO, you would see abnormally high oil temps and want to take action on that value anyway - probably before boiling happened.
Again - JMHO. I see a lot of paranoia over the 15 degree delta. Just trying to calm it down a bit.
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
IMO the 15* delta if measured at the right time... flat gound, operating temp, cusing 60mph... and the rest of the list is more then likly a fair number that is a little on the tight side of "spec"
I would belive that a number closer to the 25* spread to be with in reason.
I would belive that a number closer to the 25* spread to be with in reason.
Fleet Owner
Joined: Nov 2003
Posts: 27,900
Likes: 3,617
I agree with that, but personally think the delta is important, EGR cooler or not. I know you're not saying to ignore EOT temps with a delete, but I don't see why reasonable oil cooler efficiency wouldn't be desired.
I don't believe the oil cooler is in danger of being compromised at those temps either. I do wonder about viscosity reduction because of temperature, and if wear increases because of it.
I don't believe the oil cooler is in danger of being compromised at those temps either. I do wonder about viscosity reduction because of temperature, and if wear increases because of it.
If a person has the ability to monitor the delta, then more information is "almost" always helpful ....... just hope folks don't think that the sky is falling in with a delta at 18 (or even 20) degrees and oil temps at 235 to 240. If someone has the money, then they should think about taking action, but if they don't, then they probably have time to save up.
Lead Driver
Joined: Nov 2007
Posts: 5,139
Likes: 209
I'm no oil expert either, and I certainly don't want to perpetuate the 15* sky is falling theory.
I'm sure cheezit's seen trucks drive in with 40* or 50* temp spreads and the owner had no idea there was even a problem. Temp spreads can get even greater than that in extreme cases, and bad things can certainly happen because of it. The EOT/ECT temp delta is still important AFAIC, even with a delete, and that's the only point I was trying to interject.
I'm sure cheezit's seen trucks drive in with 40* or 50* temp spreads and the owner had no idea there was even a problem. Temp spreads can get even greater than that in extreme cases, and bad things can certainly happen because of it. The EOT/ECT temp delta is still important AFAIC, even with a delete, and that's the only point I was trying to interject.
Posting Guru
Joined: Nov 2010
Posts: 1,347
Likes: 0
From: Eagle Mountian, Utah
Pulling steep grades I have seen oil temps of 248 for short periods of time. When my oil temp goes over 240. I start to see small amounts of coolant leak out of the cap, like a teaspoon or so. Not enough to call pukeing but enough to notice on the black degas bottle cap. I think its getting really hot in the oil cooler and flash boiling in the EGR cooler. I know I need a new oil cooler, but I have a 03 motor with the round EGR cooler. So im not stressing this, my unloaded delta is like 11-13.
Laughing Gas
Joined: Oct 2007
Posts: 990
Likes: 1
From: North Pole Alaska
remote oil cooler??
I was looking at on of these on line for my truck (no my cooler isin't bad) but I thought it would be a great Idea. I just pulled a very heavy trailer through some very rough steep long hills. My "delta" was never more than 15'. But my oil temp did see 235' a couple of times. Seems like a remote cooler might be more efficient......but $1800 very steep.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
I'm no oil expert either, and I certainly don't want to perpetuate the 15* sky is falling theory.
I'm sure cheezit's seen trucks drive in with 40* or 50* temp spreads and the owner had no idea there was even a problem. Temp spreads can get even greater than that in extreme cases, and bad things can certainly happen because of it. The EOT/ECT temp delta is still important AFAIC, even with a delete, and that's the only point I was trying to interject.
I'm sure cheezit's seen trucks drive in with 40* or 50* temp spreads and the owner had no idea there was even a problem. Temp spreads can get even greater than that in extreme cases, and bad things can certainly happen because of it. The EOT/ECT temp delta is still important AFAIC, even with a delete, and that's the only point I was trying to interject.
I also get from him and you as well that when the numbers is getting over 230 and staying no matter what the delta might need to start checking on things.
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Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
Think about what the NASCAR guys do to the oil in their cars when they're running temps of 250-270 at 7-9K RPM's lap after lap on the super speedways. I know it's a different scenario but the oil related failures on those cars are really not that common anymore.
Laughing Gas
Joined: Oct 2007
Posts: 990
Likes: 1
From: North Pole Alaska
I am on my way to Georgia right now pulling a very heavy trailer. EOT stays around 217' while the ECT stays around 205 when I am running flat and level at 65mph.
When I pull a hill I have seen 232 EOT and 222 ECT. I have been backing off the throttle as I approach 1300 EGT.
What concerns me is I am about to be in some of the HOT weather states and I have hopes that my truck will do OK.
Thats why I asked if folks down here have used a external oil cooler
When I pull a hill I have seen 232 EOT and 222 ECT. I have been backing off the throttle as I approach 1300 EGT.
What concerns me is I am about to be in some of the HOT weather states and I have hopes that my truck will do OK.
Thats why I asked if folks down here have used a external oil cooler
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
I am on my way to Georgia right now pulling a very heavy trailer. EOT stays around 217' while the ECT stays around 205 when I am running flat and level at 65mph.
When I pull a hill I have seen 232 EOT and 222 ECT. I have been backing off the throttle as I approach 1300 EGT.
What concerns me is I am about to be in some of the HOT weather states and I have hopes that my truck will do OK.
Thats why I asked if folks down here have used a external oil cooler
When I pull a hill I have seen 232 EOT and 222 ECT. I have been backing off the throttle as I approach 1300 EGT.
What concerns me is I am about to be in some of the HOT weather states and I have hopes that my truck will do OK.
Thats why I asked if folks down here have used a external oil cooler
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