Hmmm... incidentally, I use WD40 in my engines after each flight. I don't fly as often as I used to now, and sometimes I don't get to fly for as long as 3 months.
My location is Singapore, very humid, and leaving any kind of metal standing for a few days will see it rust. Even stainless steel will tarnish if unchecked.
I had one heli in the past that couldn't fire up after about 1 month. Since then, I've used WD40 on my engines as a after run oil. My current heli fires up on a couple of pulls (pull start), even after sitting dormat for 2 to 3 months.
I may not know much about oils, and engines, but I know that WD40 does what I want it to do for my engines.
Cheers
