Interesting site. Wonder if that temp is specific to the Duetz engines as they are air cooled? Those Duetz engines are pretty cool, (pun intended). Does it make a difference if it is Synthetic or Dino oil? The synthetic oil would help the engine run cooler.

That would be more like a temperature I would expect (275 F). Also where are they measuring the oil temperature? I would expect the max temp for an oil would be specific to that oil, and how long it could sustain that temperature. I am measuring it before it goes into the cooler, as I figure that is worst case, aside from measuring right at the piston. I should install another temp sensor after the cooler.