Oil temp vs. Water temp Question
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Fleet Mechanic
Joined: Jul 2013
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From: 'Pitlock, Maine
Oil temp vs. Water temp Question
Hello members, I have a question regarding oil temp vs. water temp in the 6.0. I have read through a lot of the comments on this thread and have come to the conclusion that the limit of acceptable difference is 15 degrees, that being said I haven't seen any information on what the average difference is, I assume the oil will run a few degrees above the water temp as the water is cooling the oil but what would I expect to see for a spread on a 6.0 that was running under normal conditions not pulling a load just the vehicle itself?
Sorry for asking if this question has already been answered some where on here but thanks to so many loyal 6.0 owners there is just A LOT of information on here to sift through. Thanks for any help in advance....Mcrafty1, long time ford owner 1st time PSD owner.
Sorry for asking if this question has already been answered some where on here but thanks to so many loyal 6.0 owners there is just A LOT of information on here to sift through. Thanks for any help in advance....Mcrafty1, long time ford owner 1st time PSD owner.
Logistics Pro
Joined: Dec 2004
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From: South Weber, Utah
Most see single digit deltas anywhere from 4 to 9 degrees. Just remember before you compare the 2 temps the ECT and EOT sensors should be checked after an over night cold soak and should be within a degree or two of one another and for the test your truck should be at full operating temp with the ECT somewhere between 185 to 190* driving on a flat road at 65 MPH for 30 minutes or so and then check your deltas anything, above 15* indicates your oil cooler is beginning to plug. If you cant get your ECT temp up to 185* + you need a new thermostat.
Lead Driver
Joined: Oct 2010
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From: Ouray, CO
And these deltas are "generally" determined driving hi-way speeds on flat/level road (65-70MPH) NOT towing.
Years ago, the delta was 20 degrees and has since been lowered.
Remember the POINT of the delta is to INFER whether or not the EGR cooler is getting enough coolant flow to keep it from over-heating (from the hot exhaust gases) and leaking coolant into your intake.
Years ago, the delta was 20 degrees and has since been lowered.
Remember the POINT of the delta is to INFER whether or not the EGR cooler is getting enough coolant flow to keep it from over-heating (from the hot exhaust gases) and leaking coolant into your intake.
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And these deltas are "generally" determined driving hi-way speeds on flat/level road (65-70MPH) NOT towing.
Years ago, the delta was 20 degrees and has since been lowered.
Remember the POINT of the delta is to INFER whether or not the EGR cooler is getting enough coolant flow to keep it from over-heating (from the hot exhaust gases) and leaking coolant into your intake.
Years ago, the delta was 20 degrees and has since been lowered.
Remember the POINT of the delta is to INFER whether or not the EGR cooler is getting enough coolant flow to keep it from over-heating (from the hot exhaust gases) and leaking coolant into your intake.
The service procedure is now cold start and drive 15 minutes @ 1800 rpm with fuel desired @ 15 mg/st... more than 10 degree difference replace cooler.
Running unloaded @ 65 I see about 6-7 degree difference.
Josh
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It was 25 degrees under normal driving then 15 degrees WOT to 49 mph.
The service procedure is now cold start and drive 15 minutes @ 1800 rpm with fuel desired @ 15 mg/st... more than 10 degree difference replace cooler.
Running unloaded @ 65 I see about 6-7 degree difference.
Josh
The service procedure is now cold start and drive 15 minutes @ 1800 rpm with fuel desired @ 15 mg/st... more than 10 degree difference replace cooler.
Running unloaded @ 65 I see about 6-7 degree difference.
Josh
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THE CORRECT PROCEEDURE FOR CHECKING DELTAS!
NOTE: Verify that no accessories are in use (engine block or oil heaters).
Clear all the DTCs.
Cold soak the vehicle at ambient temperature for a minimum of 10 hours.
Ignition ON, engine OFF.
Access the PCM and monitor the ECT (TEMP) PID.
Access the PCM and monitor the EOT (TEMP) PID.
Access the PCM and monitor the RPM (RPM) PID.
Access the PCM and monitor the MFDES (MASS) PID.
Record the ECT and EOT sensor temperature values.
Drive the vehicle at an engine speed greater than 1,800 RPM and 15 mg/stroke MFDES for at least 15 minutes. Select the appropriate gear to achieve the operating conditions.
Does the ECT PID and EOT PID temperature values change by a minimum of 6ºC (10ºF) from when the ignition ON, engine OFF valves were recorded?
IF Yes
INSTALL a new oil cooler kit.
IF NO
INSTALL a new ECT sensor or EOT sensor in question.
CLEAR the DTCs. REPEAT the self-test.
Josh
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Cold start and 15 minutes driving I might have 145 ECT and 130 EOT.
And say if the test started with 190/190...driving 15 minutes at 1800 might show 190/194.
Josh
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Also running a/c adds a few degrees as well.
Josh
Post Fiend
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From: Manchester, CT
I have no reason to BS, i really dont care what my truck does, im just saying what my scangauge tells me. As soon as i get off the highway my oil drops down quick, sometimes it goes 191-191, or 190-192, 188-190... stays the same or very small delta around town
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Not saying what is right or wrong, but mine will run 4-8 degrees diff driving normally. If I romp it I get to 10. If I'm sitting at a stop light my EOT drops to 2-4. This is all with a/c on. The EOT does seem to drop when little or no load is involved.