> You can actually hear my '96 motor quiet down as the oil makes it's way through the head. Takes about 15 seconds. I wait for the engine coolant temp to reach

> You can actually hear my '96 motor quiet down as the oil makes it's way through the head. Takes about 15 seconds. I wait for the engine coolant temp to reach 75c before I give it a good wick. It fluctuates between 75c and 85c under good load. Pretty typical of engines of that vintage with hydraulic lifters. > Interesting to me, is that when idling down a hill it does not drop, but if left in gear going down a hill it does drop in temp. It can actually get itself below operating temperature in gear going down a hill. I presume because the heat being pulled out via pumping air through the combustion chamber is greater than the thermostat would allow to be pulled out via the radiator. I didn't think that would significant but I could be wrong. Is it a diesel or gasoline engine? My guess would be the thermostat is leaking or wrong temperature.