Oil Temps

[NickSullivan]

I've seen threads about this but I have never heard or ever saw my temps get hot until this past weekend. We usually always have a boat or horse trailer behind us along with our camper. This time it was just us and the camper. We were on our way to Cultus lake out of Bend Oregon. Its a gradual climb but nothing extraordinary, temps outside were not bad. Yet we hit 240'F for our oil temp.

 

[gsbrockman]

Based on your coolant temperature of 219*F, the oil temperature is about right. I've seen oil temps around 10*F to 15*F above my coolant temps. Generally, after the coolant temps hit 215*F to 217*F, the fan clutch starts earning it's keep.

 

[Cummins12V98]

This is pulling a combined 32,500# on a 5% grade for 5 miles. Outside temp 98.

 

[AH64ID]

Where in the engine is the oil temp sender located?

I haven't been able to locate it and am begining to wonder if it isn't another fake gauge like oil pressure.

 

[sag2]

Sorry, no oil temp sensor on the diesel. My Hemi has one and HD trucks with 6.4 Hemi have it, but this would be a calculated reading on the 6.7. On long pulls with the trailer my Hemi gets to 260 pretty easily.

 

[NickSullivan]

Are you serious! We finally have all this information available and its not even a real reading? That is a bit disappointing.

 

[AH64ID]

Are you serious! We finally have all this information available and its not even a real reading? That is a bit disappointing.

It has been that way for years. Oil pressure hasn't been real since 2003 or older with flashes.

I always laugh that they now have a digital display for an idiot light.

 

[DJAustin]

Has anyone put in a temp sender unit? I'd be interested in the details.

 

[Bill Stockard]

Sorry, no oil temp sensor on the diesel. My Hemi has one and HD trucks with 6.4 Hemi have it, but this would be a calculated reading on the 6.7. On long pulls with the trailer my Hemi gets to 260 pretty easily.

What inputs are used to calculate the engine oil temperature? Engine rpm, coolant temperature, accelerator position, boost pressure?

Is your Hemi equipped with an engine oil cooler? The big block GM gasoline engines I formerly used to tow were factory equipped with an oil to air cooler in front of the radiator.

Bill

 

[Tinman]

Both my trucks have an oil temp gauge. 06 with Optix and 01 with Isspro. Both have the sensor in the extra port on top of the oil filter housing. Probably not dead on accurate for the actual temp but it is relatively accurate. On the 06, I also have a mechanical oil pressure sensor on the same port.

 

[AH64ID]

Both my trucks have an oil temp gauge. 06 with Optix and 01 with Isspro. Both have the sensor in the extra port on top of the oil filter housing. Probably not dead on accurate for the actual temp but it is relatively accurate. On the 06, I also have a mechanical oil pressure sensor on the same port.

What kind of readings do you get?

 

[Matt_L]

What kind of readings do you get?

I have my temp sensor installed in the extra port on the oil filter housing as well.

Empty, I see around a 17* spread between coolant and oil temp.
Towing, If working hard I've seen as high as a 50* spread.

This is running 5W40 synthetic, however I don't think oil weight would matter much

 

[sag2]

What inputs are used to calculate the engine oil temperature? Engine rpm, coolant temperature, accelerator position, boost pressure?

Is your Hemi equipped with an engine oil cooler? The big block GM gasoline engines I formerly used to tow were factory equipped with an oil to air cooler in front of the radiator.

Bill

The Hemi's have the temp sensor right near the oil filter. My 1/2 ton does not have an engine oil cooler. The HD trucks with 6.4 Hemi does have an engine oil cooler.

I'm going to guess here, but I would assume the diesel uses engine coolant temp, ambient temp, and engine load to calculate the engine oil temp. It does seem silly that they just would not add a sensor.

 

[chipster]

At what temperature should I be concerned towing heavy.

 

[Newsa]

I expected slightly lower oil temps and I expected longer heat up times for the oil after installing a bypass filter. It runs an extra quart and a half of oil, but still heats up in the same time as before. And I would expect heat loss through the extra filter. Now I know why there was no change.

 

[Bill Stockard]

Comparing the two photos, I find it interesting looking a the engine rpm vs. the engine temperatures since both trucks are traveling at approximately 60-mph. Yet, the cooler engine is more heavily loaded and running in a higher ambient temperature. Notice also that the cooler engine appears to be running with the transmission in 4th gear, and according to the post, is 5 miles into a 5% grade.

Bill

 

[Newsa]

Comparing the two photos, I find it interesting looking a the engine rpm vs. the engine temperatures since both trucks are traveling at approximately 60-mph. Yet, the cooler engine is more heavily loaded and running in a higher ambient temperature. Notice also that the cooler engine appears to be running with the transmission in 4th gear, and according to the post, is 5 miles into a 5% grade.

Bill

And further comparing the trucks, doesn't the hot truck have dual radiators?

 

[Cummins12V98]

I so far am impressed with the temps all around. So what happened to the "Dual" radiator? Mine is single.

 

[NickSullivan]

There is always more to the story.....we were hauling 4 bikes on the front of my truck. This would confirm that the 4 bikes do in fact affect the air flow considerably to the radiators.

 

[Bill Stockard]

There is always more to the story.....we were hauling 4 bikes on the front of my truck. This would confirm that the 4 bikes do in fact affect the air flow considerably to the radiators.

Thanks for the "more to the story". I suspect your bikes on the front do inhibit air flow. I've seen spare tires on the front that restrict air flow even more.

BTW, Good looking truck and camper combination!

Bill