"By starting from a lower minimum temp, and returning to it when air flow over the cooling system allows, both coolant and oil temperature's are reduced, and any inherent "hot spots" caused by the mechanical design of the engine castings are running cooler."
Ah... So you're saying that due to the T-stat opening at 160 degrees, the block and oil temps NEVER reach the higher temps that they would reach with the 180 degree t-stat - therefore lowering the overall operating temp. of the motor ? This seems to make sense - much more so, than the T-stat "controlling" the coolant temperature. Thanks for the reply