Oil temp
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New User
Joined: Mar 2016
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Oil temp
Hey guys, I just recently but an sct x4 for my 05 and I hooked up the gauges today and saw a 30 degrees deference between my oil and coolant temps. I was driving at a constant speed of 70 on a flat surface. My ECT was reading 192 while my EOT got as high as 222. As soon as I got off the freeway, my ECT was 194 and my EOT was around 216. Is this a sure sign that my oil cooler is clogged? I just recently changed my oil and I have a sinister diesel coolant filter. Truck has 200k miles and I don’t know the last time the cooler was replaced. Also, I just tuned the truck and turned the EGR off on my sct but I don’t have it deleted. Could that cause my higher oil temps?
Laughing Gas
Joined: Oct 2013
Posts: 817
Likes: 6
The egr thing has nothing to do with oil temp
Your signs point to oil cooler clogging, but just to be sure, try the test again a little differently. Get up to temp, which will probably take 15 mins, then drive 55-60mph for 10+ minutes on a flat highway. This should be done with the truck unloaded, no towing. If you have a heavy truck, like a utility body or something, your results may be a bit off.
Your signs point to oil cooler clogging, but just to be sure, try the test again a little differently. Get up to temp, which will probably take 15 mins, then drive 55-60mph for 10+ minutes on a flat highway. This should be done with the truck unloaded, no towing. If you have a heavy truck, like a utility body or something, your results may be a bit off.
Thread Starter
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New User
Joined: Mar 2016
Posts: 23
Likes: 0
The egr thing has nothing to do with oil temp
Your signs point to oil cooler clogging, but just to be sure, try the test again a little differently. Get up to temp, which will probably take 15 mins, then drive 55-60mph for 10+ minutes on a flat highway. This should be done with the truck unloaded, no towing. If you have a heavy truck, like a utility body or something, your results may be a bit off.
Your signs point to oil cooler clogging, but just to be sure, try the test again a little differently. Get up to temp, which will probably take 15 mins, then drive 55-60mph for 10+ minutes on a flat highway. This should be done with the truck unloaded, no towing. If you have a heavy truck, like a utility body or something, your results may be a bit off.
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 25
From: Middle Tn.
Over 15 degrees constant and you have a problem.
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New User
Joined: Mar 2016
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Is there a way to unclog the oil cooler instead of replacing it? I don’t have the cash or the time to replace it myself right now . I saw you can flush the system out with water and purple power. Is that a possibility?
Fleet Mechanic
Joined: Nov 2012
Posts: 1,347
Likes: 110
From: Lakeland, Fl
I back flushed mine a year ago, went from a 20* delta to 5-8* using Restore and well water, it was clogged with gel. If you are clogged with rust back flushing might not do the trick.. Make sure your temp readings are accurate, check oil and coolant temps after the engine has sat over night.
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Postmaster
Joined: Sep 2016
Posts: 3,941
Likes: 240
From: Texas
I just installed this for later on. My deltas are 4-5 degrees and my oil cooler only has about 20,000 miles on it but I figured I’d like to back flush it at some point and this device is very nice. It was very easy to install since I am upgrading my turbo and had room to work but it can be done with the turbo in.
https://fixur6.com/products/back-flush-valve
https://fixur6.com/products/back-flush-valve
Fleet Owner
Joined: Nov 2003
Posts: 27,881
Likes: 3,595
The thing to remember regarding the oil temp is that the hotter it is, the more quickly you will see the o-rings degrade/harden. Since, the oil in the pan is significantly hotter than the EOT reading, then the oil in the HPO rails is most likely significantly warmer also.
Just another reason to keep the oil cooler working well.
Just another reason to keep the oil cooler working well.
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