In answer to surgin's post, the drivetrain is designed to run at 185 - 205 degrees. The engine controls, sensors, and cooling accessories are calibrated for that setting. The old wives' tale is that running an engine cold is somehow going to "boost performance", which is very far from the truth. Yes, the engine runs colder: the fuel/air ratios are slightly richened to compensate for an engine which never warms up to design temps. The oil and engine metal remain below 200+ degrees, so the crankcase combustion byproduct volatile acids and condensation moisture never vaporize in order to be burned by the PCV system. Cylinder wall temps stay low, so there's more raw fuel to wash off lubrication. Automobile manufacturers have absolutely no idea how to design and run an engine, so we must make it better. We have learned exactly nothing in 126 years of engine building.
You can buy thermostats for $7.95 at NAPA. Any temperature you like. Any car you like. ("Yeah, but, Sub, How come boat engines run at 140 and 160 degrees ???" - "Because some boat engines are raw water cooled, and to run them at 205 causes incredible scale in the exhaust cooling systems. The fuel systems are designed accordingly and the crankcase ventilation systems are impressive."