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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van

oil temp drops suddenly

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Old Mar 12, 2015 | 07:20 AM
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oil temp drops suddenly

As the title says, my oil temps will maintain around the EOT (ususally 3-4* higher). There are days when it stays there, then there are other days when the oil temps will drop about 10* cooler and slowly come back up.

Yesterday I flushed the cooling system, installed the Mishimoto 200* t-stat, and added a coolant filter. My truck has 111K+ miles on it. It runs like a top, have had it for 2 years and only use T6 oil. I am running an SGII

What could possibly cause this, and has anyone else seen anything like it before?
 
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Old Mar 12, 2015 | 07:31 AM
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Clean and reinstall the connector on the oil temp sending unit. Worked for me.
 
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Old Mar 12, 2015 | 08:50 AM
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I agree since it comes and goes more than likely a connection issue.
A biased sensor once biased useually stays biased.
 
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Old Mar 12, 2015 | 08:51 AM
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Ditto. Re-seating the connector worked for me. A little surreal to be cruising along the highway towing a trailer and see the oil temp at 165...
 
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Old Mar 12, 2015 | 09:17 AM
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I'll have to take a look at that after work.
 
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Old Mar 12, 2015 | 10:20 AM
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Pull the switch and spray with WD40 (it displaces moisture). Reconnect then disconnect and reconnect again to clean the pins.
 
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Old Mar 12, 2015 | 10:28 AM
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if memory serves me the temp sending unit is the grey connector right?
 
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Old Mar 12, 2015 | 10:36 AM
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2 wire plugin. single wire is the gauge switch. Color I really don't remember.
 
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Old Mar 12, 2015 | 10:37 AM
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ah, ok. I was thinking there were 2 sensors up there. One being the temp, one being the pressure....
 
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