Engine OIL temps
Fleet Owner
Joined: Nov 2003
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Before condemning an oil cooler, make sure the temperature sensors are reading accurately. With a completely cold engine, the ECT and EOT should read about the same. Even this isn't a complete check, but it is usually enough. To do a more thorough check, you can remove, clean, and swap the two sensors - they are the same part. If the oil cooler is an issue, the temperature profile will be the same as before switching sensors.
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Senior User
Joined: Oct 2018
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Originally Posted by bismic
Before condemning an oil cooler, make sure the temperature sensors are reading accurately. With a completely cold engine, the ECT and EOT should read about the same. Even this isn;t a complete check, but it is usually enough. To do a more thorough check, you can remove, clean, and swap the two sensors - they are the same part. If the oil cooler is an issue, the temperature profile will be the same as before switching sensors.
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Senior User
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Originally Posted by bismic
Oh - also verify that your coolant level is fine in the degas bottle and look the coolant over pretty good (ie no contamination or sludge).
Mountain Pass
Joined: Feb 2016
Posts: 249
Likes: 58
I'd change that thermostat out and since you need to drain the coolant, you can inspect the coolant in the container you catch it in. Easier to see than what's in the degas tank. A universal joint and extension will be your friend for the T-stat housing bolts. A zip tie or something to hold the sensor cable going to the fan shroud out of your way too. I just did a coolant flush and swapped to CAT EC-1, so this is all fresh for me. You can loosen the hose clamp on the upper radiator hose at the radiator. Leave the other end of the hose clamped to the T-stat housing. Then once you take the bolts out, pull the hose and t-stat housing out as a unit. It's easier than fighting the hose clamp with the CAC tube in your way.
Hotshot
Joined: Dec 2014
Posts: 17,824
Likes: 3,104
From: Jersey Shore
Today if you are going to endeavor to do any work involving coolant hoses small or large, you need that tool. The percentage of spring clamps out there in the open is very low on modern vehicles.
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Senior User
Joined: Oct 2018
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Sorry guys I just barley got to drive my truck today, first thing I checked was cold temps. Engine was only running for 2-3 min. 30 degrees and raining outside, the engine oil was at 46 and coolant was at 64 degrees. I will update after I've driven it a while
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So I just did about a 40 mile drive give or take a few. Coolant temps never got higher than 170 and when driving they dropped to 140-150... this is all city driving by the way. Oil temps got as high as 206 but then would go down to 194-197. While driving at about 50 mph my coolant temps would go down to 140-150 by oil temps would stay around 200, even 206
Mountain Pass
Joined: Jun 2014
Posts: 231
Likes: 4
From: Texas
Did you notice the ECT and EOT values on OBDII scanner before starting engine as Bismic suggested?
Before condemning an oil cooler, make sure the temperature sensors are reading accurately. With a completely cold engine, the ECT and EOT should read about the same. Even this isn't a complete check, but it is usually enough. To do a more thorough check, you can remove, clean, and swap the two sensors - they are the same part. If the oil cooler is an issue, the temperature profile will be the same as before switching sensors.
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Senior User
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Originally Posted by BjornF16
I see values for engine running for 2-3 minutes...not the same as engine off, cold values.