Oil Temperature. What is too hot?

[Wingnut73b]

2018 3500 aisin 3.42. Towing 10k up a 16% grade oil temp hit 237 degrees. Seems alittle hot . What can I expect.

 

[jhenderson]

There is no oil temp sender. You can expect whatever the computer thinks it should read. It’s nothing but an algorithm and has no direct correlation to actual oil temp.

 

[AMink]

Interesting. The headlights can dim themselves but no real sender for trains temp. Is that the same for other temps? Turbo etc?

 

[Cummins12V98]

2018 3500 aisin 3.42. Towing 10k up a 16% grade oil temp hit 237 degrees. Seems alittle hot . What can I expect.

Fill in your public signature.

I towed up a several mile stretch of 14% locked in second towing a combined 33k and temp was in the low 170's. Now if you were in 1st gear those temps are realistic as the torque converter is not locked!

 

[kthaxton]

Fill in your public signature.

I towed up a several mile stretch of 14% locked in second towing a combined 33k and temp was in the low 170's. Now if you were in 1st gear those temps are realistic as the torque converter is not locked!

He's talking about engine oil temps.

 

[Newsa]

2018 3500 aisin 3.42. Towing 10k up a 16% grade oil temp hit 237 degrees. Seems alittle hot . What can I expect.

It is an algorithm as others mentioned. Probably based on estimated fuel consumption (because it doesn't have a fuel flow meter), engine speed, coolant temp, transmission temp if you have an automatic, and maybe some other data?

I wonder if the engine partly derates when it gets to 240 degrees F. I think the algorithm is predicting the temperature of the actual sump? So what does that mean for the oil cooling the cylinder walls and turbo?????

At 240+ degrees, conventional oil begins to break down (boil/vaporize, create varnish, and basically loses it's ability to perform as a 40 weight oil).

Synthetics will not vaporize and decompose as quickly and will retain their SAE 40 weight lubricating characteristics at temps above 240 degrees.

I use synthetics (not advertising any brand here) and I really like one synthetic blend that I have in the Cummins now. I also use a bypass oil filter which exposes the oil to another filter (which exposes a hot filter to the ambient air temp & helps it cool some of the oil) and increases the oil capacity by almost an additional quart. Not to mention, it keeps the soot level down.

 

[Learjet]

no oil pressure, no oil temp...so everything is fake????

 

[jhenderson]

Water and trans temp are actual readings.

 

[Newsa]

Oil readings are calculated.

 

[Learjet]

ok I will never look at those readings again

 

[Cummins12V98]

He's talking about engine oil temps.

OK, how do you know that? There is a missing word. ENGINE oil temp or TRANSMISSION oil temp.

"Towing 10k up a 16% grade oil temp hit 237 degrees."

 

[kthaxton]

OK, how do you know that? There is a missing word. ENGINE oil temp or TRANSMISSION oil temp.

"Towing 10k up a 16% grade oil temp hit 237 degrees."

Two things...usually, when someone only specifies "oil", they are usually talking about engine oil. Further, the temperature he gave, is a typical oil temp for his conditions.

Apparently, I'm not the only one that deduced that he meant engine oil.
I could certainly be wrong, but I bet I'm not.

 

[Wingnut73b]

I apologize, engine oil is what I'm asking

 

[jhenderson]

You have nothing to apologize for. Oil goes in your engine. Fluid goes in your transmission.

 

[Cummins12V98]

Two things...usually, when someone only specifies "oil", they are usually talking about engine oil. Further, the temperature he gave, is a typical oil temp for his conditions.

Apparently, I'm not the only one that deduced that he meant engine oil.
I could certainly be wrong, but I bet I'm not.

Could have been trans as he said he was climbing 10% and could have been in 1st gear. Why not be clear when posting???

 

[kthaxton]

It's really not that big of a deal, certainly not worth complaining about.

It would be better to just accept you made the wrong assumption and not think twice about it.

 

[AH64ID]

I was under the impression that oil temp was a fake reading, as many others are, however I now have reason to believe that it's not fake.

There is a new sensor in the block by the turbo that looks like it might be the oil temp sensor.

I also have about 1500 miles on my Dads 17 watching oil temp, and about 1000 miles on the newly installed oil temp sensor in my 2005... and let me tell you that if it is an algorithm they did AWESOME! It reads exactly as I would expect based on watching my oil temp.

The limit, from Cummins, for an ISB with EGR is 275° on oil temp and 248° without an EGR.

Pulling hard but not hard enough to get the thermostat full open is where the biggest delta is between coolant and oil temps. Once the thermostat is full open the oil cooler is more efficient and doesn't have such a temperature delta. Even then I haven't seen more than +25°F on my 05 while towing.

 

[jhenderson]

Go to your dealer and purchase an oil temp sender. I’ll give you double your money for it.

 

[brods]

Fill in your public signature.

I towed up a several mile stretch of 14% locked in second towing a combined 33k and temp was in the low 170's. Now if you were in 1st gear those temps are realistic as the torque converter is not locked!

In case you weren't aware, only paying members can have a sig now and only paying members can see the sig (if they choose to), so the signature's value is limited anymore.

.....
I also have about 1500 miles on my Dads 17 watching oil temp, and about 1000 miles on the newly installed oil temp sensor in my 2005... and let me tell you that if it is an algorithm they did AWESOME! It reads exactly as I would expect based on watching my oil temp.
......

Awesome? That is nice it works, but as we all know the main value of a gauge is to alert you to a out of normal situation. An algorithm that only gives "normal" readings, even when something is wrong, is the worst case possible! Better the operator has no information rather than being mislead by incorrect information.

 

[Cummins2014]

Could have been trans as he said he was climbing 10% and could have been in 1st gear. Why not be clear when posting???

You been had again, it seemed clear to me as well as others.