I was wondering, I know the thermostat is supposed to be a 180F, but what's the normal real-world engine operating temperature? The other day when I was driving on the highway it stayed in the 160's. This morning, the engine warmed up to 130 very quickly, then actually started cooling down again when I was sitting at a light. I think my thermostat may be partially stuck open, or opening way too soon. The outside temp was 57F.