Oil Thermostat
Lycoming engines usualy have a thermostat (usualy refered to as a vernatherm) installed in the housing the spin on oil filter fits to.
It is set to regulate the oil temperature to 180F, this is the temperature that Lycoming recomend to boil off the contaminates that are the cause of most internal corrosion.
Lycoming also recomend that you check the oil temperature system by putting the oil temp probe into a can of engine oil, heat the can and with a calibrated thermometer check the readings on the aircraft gauge.
As you might think The 180F mark is critical for engine health.
Last edited by A and C; 22nd Jul 2015 at 06:39.