Quote:
Originally Posted by Gaz64
With the engine at operating temperature for an hour, and the oil temp has this difference, I would think the temps of both fluids should be closer to each other. One of them is lying.
Might depend on where you are reading oil temp from. Your coolant temp sensor is up high in the coolant path. I have one car with oil temp AFTER the pump, not in the sump. The sump is where the oil is the coolest before doing the lubrication path again. |
It's my understanding that the sump is where the oil temp is the HIGHEST.
That's where the oil is fresh off the bearings.
Measuring it after the pump, and before the filter and cooler, will give a near identical temp to the sump value.
I generally want to know the HIGHEST oil temp in the engine. In my Cobra I measure is the sump, but many engines don't have a bung in the pan, so I measure at the pump output.