Your oil temprature and engine type

Acutally no cat truck engine ECM measures oil temp, the gauge on the dash is an OEM deal and only for your benifit. I cant speak for others but newer Freightliners and Western Stars out here do as you say, they estimate the oil temp that is displayed on the gauge. if you search the engine you will not find an oil temp sensor anywhere. Weird huh?
The only execptions to this with new Freightliners and Stars is Brakesaver equipped engines have a capillary oil temp gauge supplied by Cat but again the ECM still doesn't measure the oil temp.

 

That would explain why the brakesaver oil temp gauge reads different to the engine oil temp gauge when cruising down the road

 

Yah, most oil temp readings for the dash come from the sensor that is installed by OEM in one of the lower oil pan plug ports. It will be close, but not perfect. Generally, oil temp is about 10-20 higher than coolant.

 

I have 95 kw t600 3406 e, fresh rebuilt 32k miles ago, before the rebuilt oil engine temp never went pass 150 and coolant temp was always 180-190, now the engine oil temp reads in middle of 150-200, kinda scared me when it jumped up as i never seen it rise that high in my 5 years running the truck

 

Mack E-7. Water temp around 180. Fan comes on 195. Oil stays around 190-200 Mark unless working it real hard

 

C15 Cat ,. 185 to 195 coolants , the fan hardly ever comes on except when pulling big hills.
Oil 170 to 185

 

I am accustomed to axles running 220, trans at about that much and engine oil temps about that much. If all are in agreement more or less with a stable hot water coolant at 185 or so, and the pressures are good then everyone is happy.

The 2001 era trucks did not provide that information very well. So we did without it. It's more going back in time to the older iron. There is not too many times I whip a engine past it's values. I put a 350 cat against a very steep grade for a hard pull for a hour and change. The gauges all maxed out and stayed there for a couple of hours after. Fortunately it was the last of the mechanicals I suppose or it would have shut down.

If you are fortunate to run a older kitty cat, hang on to it. There may be a time in the future you will ask it to do something pretty big and it's going to do it.

 

210 F, volvo D13, 50 degrees outdoor temp, 62mph, 20,000lbs in the box, aprox 54000 gross, Rottela T6 synthetic.

Thermalbreakdown/oxidation starts from 240-250 degrees for petroleum based oils, from 275 degrees for synthetics.

"What is thermal breakdown?
What happens when a car's engine gets too hot? Well, lots of things, and none of 'em good. Thermal breakdown is among the most damaging effects, and occurs when a car's internal heat causes a chemicalreaction in the motor oil, which causes the oil's viscosity to change. Basically, if (or more accurately, when) the engine heats up beyond a certain temperature threshold, the motor oil will start to degrade."
What is thermal breakdown?