Within the last week or so i have been noticing that my engine temperature has been fluctuating quite a bit while i drive. I will look at it for one second and it would be up about half way ( a little more than normal) and then drop down to a 1/4 inch above C for cold. What may be causing this? Any ideas? I had my oil changed about a week ago when i started noticing this, could that be it? My coolant level is fine also! hmmmm

check the thermostat take it out then put it in water and boil it. if that works then get a coolant flush done or it could even as simple as the sensor going goofy.