Agreed, 180* is a good T-stat to run and as IndeedSS pointed out there can be cylinder wash issues. Also, if you are getting cylinder wash, its getting into your oil and thinning it out and will do so in very short order. Fuel dilution of only 2% is considered dangerous to an engine. It will thin the oil out to dangerous levels and reduce your engine protection and will accelerate wear.
Additionally, if you would like even more protection and dont mind the added expense, get a MotorRad t-stat. Its designed to lock in the open state if it should fail.
