Lone:

Air cleaners? After run oiling? Do as you please. I did.

I flew in a dusty area, so after a little searching I started using "Bru-Line" fine mesh air cleaners on all the engines I could. Some engines have inlet nubbins too short to mount one, you can "Shrink" a short brass tube on it, then the Bru-line will mount.

My oldest Saito, "Iron Annie," is the old "Big-Fin" version 1.20, with the smaller rear main bearing. It's about ten years old, original piston ring still in service.

And I never did use after run oil.

Then I noticed several of my engines making awful noises. Mains gone.

A few hundred dollars later, for bearing replacements, I became an after-run oil disciple.

The Bru-Line filters can be had from Tower Hobbies and others. And my after run oil comes out of the same barrel as "Air Tool Oil" and "After Run Oil," but I take it out of the tap that says "Dexron II Automatic Transmission Fluid."

STP, DuPont Golden Seven, Motor Medic, Motor Honey, Shaler's Rislone Concentrate. Again, same barrel, different labels and prices. Take your choice.

And if your choice is to use an air filter and A-R oil, from whatever source, I think you'll be happier in the long run.

Without, your new engine's fast.
. But with, you'll find it will last.

Bill.