RB's "secret special treatment" as you refered to it is a hard coating that is only in their high end motors. No matter what brand motor you run, you need to use after run. They all have steal cranks. The best practice is:
Run you car out of fuel on the last tank.
Clean around the glow-plug with your favorite motor spray.
Dry off the motor spray.
Remove the glow-plug.
Drop in 8 or 10 drops of after run oil.
Re-install the glow-plug.
Turn the motor over a few times (some guys put it on the starter box, I just do it by hand with the plug still loose).

Running the motor (& fuel tank) dry removes the fuel. Left over fuel attracts water & will speed up the rusting of the motor. The after run oil will coat the inside of the motor & inhibit the formation of rust. If you want your motors to last you need to use after run oil. The cleaning of the glow plug area before removal is to prevent dirt from getting in the motor when you take out the plug & put in the oil.