Originally Posted by
Plutus
Ok here is the dilema with block heater and automatic teansmission. When u have cold engine its giving you at least a hint to warm it up before starting to drive because it makes u feel engine is not ready yet to handle the load. Now consider block heater installed case u start the engine and there is no hint that transmission is not ready yet so there is no feedback from engine to driver u start driving without any sense of transmission oil temperature. Which in case can result in premature transmission failure.
So i would recommend block heater only in extreme cases.