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post #1 of 5 Old 02-08-2012, 10:49 AM Thread Starter
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Oil cooler

Ok just bought my truck and had a question.

My ECT and EOT run a average of 9 degrees off of each other while driving normally. ECT is about 162-164 and the EOT is about 171-173. Pulling hills the difference will go up to 12 degrees.

Pulled a very steep grade up to my house while pulling my jeep (4700 pounds) and the difference was about 15 degrees and my ECT was about 182 while EOT rose to 196.

Is this normal or is my oil cooler clogged and in need of replacement.

Any suggestions on which coolant to buy?

O yea, it has egr delete but does not have a proper tune to turn it off. check engine light is on since the egr is gone.

Last edited by Blown03HD; 02-08-2012 at 11:11 AM.
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post #2 of 5 Old 02-08-2012, 11:27 AM

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It's probably starting to clog, but nothing to get overly concerned about. When driving normally at 65mph on flat ground with no load, the delta should stay below 15*F.

Shawn Carlson

Proud Navy Vet
2005 F250, CCSB, 6.0 PSD, FX4 (The Sweet Unit is white)
2008 F350, CCLB, 6.4 PSD (Brad-the wife's truck is black)

Engine Mods:
CCV Reroute (Reinstated)
4" MBRP Exhaust
MTW Stage 1 Turbo
Bulletproof 53V FICM
BulletProof EGR Cooler
BulletProof Water Pump
Riff Raff Intercooler Boots
Gogo Diesel Direct Drive Solenoid
BulletProof All-Aluminum Radiator
BulletProof All-Aluminum Intercooler
BulletProof Oil Cooler System w/ Bypass Filter
SCT w/ Custom Tunes (TSD, DJ's, Innovative, Gearhead, QuickTricks)

Exterior Mods:
Bilstein 5100 Shocks
Icon Adjustable Trac Bar
Firestone RideRite Air Bags
BDS Dual Steering Stabilizer
Aluminum Finned Differential Cover
Reese 16k Manual Slider 5th Wheel Hitch
Icon 2.5" Leveling Kit w/ F-350 rear blocks
20" BMF Novakanes wrapped in 33" Nitto Terra Grapplers
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post #3 of 5 Old 02-08-2012, 05:35 PM
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It looks like you will need to replace the thermostat, ECT seems to be running a little on the cool side. I believe you should see 190* ECT or very close.
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post #4 of 5 Old 02-08-2012, 05:51 PM
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Flush the cooling system and refill with a catipiller EC-1 rated Extended Life Coolant.
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post #5 of 5 Old 02-08-2012, 06:58 PM
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Your t-stat is stuck open. Repl t-stat and retest. That test is not accurate unless ect is atleast 190
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