The perfect delta????
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Elder User
Joined: Dec 2012
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From: Magnolia, TX
The perfect delta????
Was driving to a job today that was 2.5 hrs away. While cruising mostly 70, my delta was good and steady at 8 degrees. Even the day after my oil cooler was replaced and ELC coolant and coolant filter added, my delta was at best 6-7. That was a shorter trip but a good reference point.
I wondered what is the perfect delta? Random thought I know but if everything was in perfect condition, what delta reading would you get? Probably not zero, I'm guessing, but what would it be? What say you? Any thoughts?
I wondered what is the perfect delta? Random thought I know but if everything was in perfect condition, what delta reading would you get? Probably not zero, I'm guessing, but what would it be? What say you? Any thoughts?
Senior User
Joined: Mar 2006
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From: Md.
My delta's have peaked at 8 (extreme tow haul driving) and I will probably get them higher this summer but that doesn't concern me as much now due to the fact of how fast my eot comes down to 191 or lower and follows ect during regular driving
Fleet Mechanic
Joined: May 2006
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From: Illinois
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Elder User
Joined: Dec 2012
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From: Magnolia, TX
I thought if your delta was getting close to 15, your cooler is starting to get clogged. Is this incorrect?
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Postmaster
Joined: Sep 2010
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From: Southern Cal
Last trip it went up to 20* on a climb just for a second and back down to 14-18* or so on my Dashboss.
Thinking its time to flush soon.
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2 factors are worth considering:
The first is how well the oil temps come down from being "worked" If you run an 8 degree spread @ 65 and then slow down to 30, do the temps come down to say 4? Or remain at 8 no matter what? The temps should come down.
The other is observation over time.
If you consistently see an 8 degree spread @ 65 over the course of a year and then gradually see 10, then later 12 and later 15... the cooler is plugging and it would be a good idea to consider swapping it out.
However
If the engine has an EGR delete, guess what? The temp difference doesn't matter as much and the key number becomes 253. Why 253? That is the upper limit of when the PCM goes into limp mode. With no EGR cooler to take into consideration the temp difference isn't as much of a concern.
Though, 210 degree oil is far better than 250 and so on.
Just watch the temps, if they start climbing, consider a flush and new cooler before it becomes a bigger issue later.
Josh
Senior User
Joined: Aug 2012
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From: Chester, Va
My delta's get up to around 10-12* difference at 70-75mph with no load, however, my oil temp hasn't been over the 200 Mark yet and when it did reach 200 I was sitting at the drive through in 81* weather for almost a half an hour. When I get off the interstate, my delta's quickly drop back down to a 4-5* difference while driving around town. From what I understand, that seems to be pretty healthy.
Logistics Pro
Joined: Feb 2013
Posts: 4,073
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From: TX
One thing I've noticed especially yesterday is that it takes way longer for my oil to get to temp then the coolant. It was the warmest weather yesterday since I bought the truck and it took longer than I have ssen for the oil temp to come up. Now that was leaving work and had a bit of traffic. Does the time it takes to get to temp say anything about the health of the oil cooler ?
Hotshot
Joined: Jul 2005
Posts: 13,834
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From: Middle Tn.
One thing I've noticed especially yesterday is that it takes way longer for my oil to get to temp then the coolant. It was the warmest weather yesterday since I bought the truck and it took longer than I have ssen for the oil temp to come up. Now that was leaving work and had a bit of traffic. Does the time it takes to get to temp say anything about the health of the oil cooler ?
On another note, there have been some on here that have had 12 to 14 degree deltas and it never got worse over the course of years.
Tuned
Joined: Dec 2013
Posts: 399
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From: Rockport, TX
Deltas are the difference between your EOT (engine oil temp) and ECT (engine coolant temp). Should not exceed 15 degrees at 65 mph on flat surface with fully warmed engine. My EOT is usually around 202 and ECT around 194. My delta is 8. The pic in this thread shows both temps. You do the math. I don't have an AE, I have ScanGauge. But I'm sure you can check those temps with AE. I hope that helps. The more experienced guys here may have a better explanation than that.