[mr0077]

Mulv, FWB is right. The 160 degree T-stat won't keep the motor cooler than a 180 degree T-stat, and a 180 won't cause the engine to overheat. The engine will run at whatever temperature it's system reaches stability for the conditions, unless it is stable at a temperature below the T-stat opening temperature...in which case the temp will cycle up and down as the T-stat closes and opens. The higher temp T-stat just helps the motor reach ideal temperature faster, reducing wear and making the motor more efficient.