What is the recommended procedure for cooling down a heavy commercial turbodiesel engine after a hard highway run or steep mountain climb before shutting it down?

1. Shut off the ignition instantly while driving at full throttle
2. Allow the engine to idle smoothly for 2 to 3 minutes to allow circulating engine oil and coolant to dissipate extreme thermal heat from the turbocharger bearings and prevent oil coking (carbonización del aceite)
3. Pour cold water directly onto the glowing turbocharger
4. Rev the engine to maximum RPM before cutting the key