I’m really not advocating using WD40 as much as I am challenging your assertion. “DO NOT USE WD-40! It is proven to evaporate and attract moister!” If you have some documentation that supports your assertion I would like to see it. Or you could simply state you have no documentation and this is only your opinion. When you exaggerate to make a point you lose credibility.

I’m not trying to embarrass you I am simply trying to keep the information on here credible. There are many people that are very new to the hobby and it helps them out if our information is based a little more on facts.

More than coating an engine with oil the after run process is to flush the engine of any methanol. The methanol attracts moisture (that’s what hygroscopic means) if there is no moisture there is no rust. If you are storing an engine for extended periods I think it’s a good idea to use some sort of ARO.

The following quote is from a major engine manufacturer.

“When a nitro engine is shut off, some excess unburned fuel remains in
the engine. The methanol in model engine fuel is hygroscopic, which
means it easily attracts and absorbs moisture. This moisture can cause
rust and corrosion on the steel engine parts (crankshaft, bearings, wrist
pin and starter shaft) if the fuel is not removed from the engine.”