What Temperature Should A Diesel Engine Run At. For most mass market cars 6065 degrees Celsius is where the engine really starts to come into its own. The maximum cooling water temperature you should see on your instruments will generally be at or below 195 degree F.

As a general rule of thumb after the car is warmed up oil tends to be a few degrees warmer than the coolant usually 10-15 degrees Fahrenheit. He says proper operating temperature for most tractors is 180-degrees. On this new truck the tranny is running around 190-195 with an engine temp of around 200-205.
Most engines marine or otherwise run at around 85C 185F sorry I am metricated as controlled by their thermostats.
Cold engines will overfuel and wear out prematurely due to never reaching thermal equilibrium. The maximum cooling water temperature you should see on your instruments will generally be at or below 195 degree F. I have a 2007 classic Chevy 3500 with the duramax 66l and Allison transmission question is the temp gauge runs about 205f and shouldnt the normal running temperature be at 185f. The normal engine operating temperature for a 3306 Caterpillar diesel engine is 180 degrees.
