I may have found the Holy Grail of oil coolers!

[sargar]

I'm stumped here.

Truck is an 05 F350 dually 2wd automatic. 191,XXX on mileage.

Customer complains of wrench light on and a skip when towing only. Truck had 2 fuel level sensor codes, egr performance code and a cyl 8 glow plug circuit code. Truck runs like a top for me.

I assumed the oil was getting hot and defueling on him. So I drive it home last night and can barely get the oil temp to match the coolant temp on a 20 mile drive. This morning I put an oil temp sender in it, assuming that it is lying to me. Just got back from a 45 minute test drive and the oil temp NEVER exceeds the coolant temp.

A little history. This truck got ONE cylinder head at 92,XXX miles and hasn't had so much as the valve covers off of it since. Even if it got a cooler then it would still have right at 100K on it. It is still running Ford Gold coolant!

Have I found the world's most efficient oil cooler or am I missing something? If it works that well I'm selling him one and putting his used one in MY truck!

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[ZMANN]

I say something is a miss

this isn't even possible in my world after the truck comes to temps the oil is never lower

[sargar]

Nor mine. I see new coolers run 4-6 degree deltas.

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[ZMANN]

thats what mine see's

[Six0~Stroker]

bad coolant temp gauge/sender?

[sargar]

I don't think so. They start at the same temps when stone cold. Coolant warms faster...sounds normal. Oil will finally catch coolant and they will run 190 - 192.

I'm up for putting a coolant temp sender in it but I have zero faith in it changing. Even if it did my oil is still only 190 after 30 minutes.

The conspiracy theorist in my wants to ask if Ford ever had any "special" software flashes to help hide bad oil coolers. Maybe modify the data? I know better but this truck is really strange.

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[Six0~Stroker]

no... it seems the coolant is good!
So, what are the actual HARD numbers for the deltas?

[outlaw507]

My truck does the same thing. You have to drive it for 30 to 45 mins for the oil temp to get anywhere close to the coolant temp

[gsracing38]

Have you tried anything else yet? I'd be curious to at least look at the oil temp sending unit to see if there was any gunk or anything that might cause the reading to be off.

[ZMANN]

Originally Posted by gsracing38

Have you tried anything else yet? I'd be curious to at least look at the oil temp sending unit to see if there was any gunk or anything that might cause the reading to be off.

the oil sender is new

This morning I put an oil temp sender in it