as jon says,also depends where you keep your cars and for how long between being used.
i guess im lucky and have a nice warm modelroom where the cars get stored,i never use any afterun oil nor drain the tank or engine of fuel,it comes off the track and into the modelroom,ive never had a rusty crank or bearings etc..now if the car was going into a garage or shed then the same engine would get ruined pretty easily using the same routine.
the nitromethane will absorb any moisture from cold air,then when the methane eventually evaporates it leaves behind the moisture..next step rust,hence why the afterun oil helps,altho fuels laden with caster oil do help somewhat as it doesnt get burnt off like the synthetic oils and helps to keep the engine lubed up somewhat.
so if your storing somewhere cold and damp,run engine out of fuel,lube it up and empty the fuel tank.
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