by RCModelReviews » Sun Sep 26, 2010 8:17 pm
Some people use automatic transmission fluid, I've used Mobil 1 synthetic, and others swear by air-tool oil.
The ones you shouldn't use are WD40 (very little lubrication and not that good at rust-prevention) or anything with silicone in it (it will foul your plug when you run the engine next time).
I've found that the Fuschs AeroSave oil I use when making my own fuel has incredible after-run protection and so I've not had to bother with ARO since switching to this oil.
RCModelReviews.com, just the facts.