Lower thermostats, really needed?

[Silverado4x4]

Thermostats aren't cooling devices - they're heating devices. That is, they make
sure your engine stays at a MINIMUM temperature, not maximum. They keep the
coolant from circulating to the radiator until the engine has warmed up enough,
and then maintains that minimum temperature. So once there open there open and not going to make your motor run cooler.

Lower thermostats don't solve overheating problems! Hotrodders
use them because they reduce the heat under the intake manifold and therefore get a
slightly denser intake charge. But, running your engine cooler increases wear
and decreases efficiency, so that denser charge comes at quite a price.

A lower temp thermostat won't make the car run any cooler - just warm up
more slowly.