ORIGINAL: Flyboy Dave

OK, everyone has their own methods of maintaining their engines. I'll
smile and nod when I see a Fella putting a few drops of oil into his carb,
then hand flipping the prop a few times to "distribute the oil". There is a
small chance that some of that oil could find it's way onto a bearing
surface somehow....or perhaps find it's way up through the crankcase
and splash a drop on the cylinder wall....but I doubt it.

But, I wouldn't discourage a person from using an after-run oil....however,
I have never used an after-run oil myself. I do use an elixir of 50/50
kerosene and Marvel as a rinse....before storage of an engine. This is done
by pouring several ozs. into the exhaust port, with the piston down, and
flooding the crankcase.

I do not run my engines dry at the end of the day, rather I suck the remaining
fuel in the fuel line and carb into the engine....after the plane has been de-fueled.

In 35 years of running the aero-model engines I have never had to replace
a bearing due to rust. My bearings usually last in the range of 12-15 years.
The only bearings I have had to replace.are the ones in used engines that I
have acquired.

Just lucky ?....I think not.

I've been using the same oil mixture for about 25 or more years.

2/3 Klotz....and 1/3 castor as a standard. Sometimes I will put in more castor
for a new Rossi, or break-in of a new four stroke, but that is the exception. I
am thinking that the rust (corrosion) fighting additives in the Klotz, and the
natural coating of the castor....has teamed up....and afforded my bearings an
exceptional long lifespan.

I won't be changing my oils....any time soon.

FBD.