For water, the standard is to measure it as it leaves the engine, which is the hottest point.  I would think that's what you'd want to do with the oil as well, but unfortunately, there's no practical way to do that.  The oil drips back to the pan from different places, and you can't measure that return flow directly.  You can measure the pan temp, as I did originally, but it's not the best reading, since there isn't really a constant flow of oil past the sensor.   I suspect that measuring the oil as it returns to the engine was selected as the next logical point.  I have the pan temp hooked up as an Aux temp on the EM-2, but I can't say I've looked at it yet.  Maybe when Tracy gets around to that data logging... :-)
 

Someone else said that the remote oil filter was a good place to put the sensor, so I'm going to check into that this afternoon, and see if that is possible. 

 

Steve

 

Steve, just be aware that the 210F limit referred to is measured after the oil cooler.  So if your filter is after your cooler then you will be measuring it at the "recommended" point.  Not to say you can not measure it at the filter even if before the cooler, but clearly if it has not gone through the oil cooler yet, it will be considerably hotter than 210F.  As Rusty mentioned, the oil pan is not the best place to measure temperature.

 

Ed Anderson