Upon further review I read the manual for the OS FS 70 ll Surpass and it says to (take out the glow plug and add a few drops of after run oil into the plug hole then flip the prop over a few times).

I also have an O.S. 46 AX and "that" manual says (Do not inject after run oil into the carburetor as this may cause the O-Ring inside the carburetor to deteriorate)!

(This procedure will reduce the risk of starting difficulties and of internal corrosion after a period of storage) it also states!

Therefore, I will only use After Run Oil whenever I plan on storing an engine for a period of time!

Hmmmm! A friend of mine had an O.S. 40 stored in a cold garage for 5 years. Did nothing to it after his last flight, got it back down 5 years later, blew the dust off of it and it started right up! The engine is still going strong!

I'm gonna do like RC Ken mentioned. Forget about the after run oil (and save my money for more planes)!

Edit; If I crank up an engine around 14,000 rpm's and it don't knock off any rust, I don't want that engine period!

jimmy