ORIGINAL: Adui
Well... Im no expert, new myself. However, my Plane has an OS .46 FX on it. After much frustration my first go at this hobby I put afterrun in it, (Marvel actually) and hung it up for 4-5+ years with absolutely no other maintenance. Perhaps I got lucky but the only thing I did when I started back into the hobby was to tear the motor down and clean all parts with Alchohol, then oiled it up real well and reassembled it. My current instructor was able to start it right up and made almost no adjustments to the tuning to get it to run like an OS should run..
Glad to hear you had good luck with this, I have always put marvel air tool oil in my motors. I plan to oil them with marvel and let them set with some fliping the props from time to time to get oil worked into everything. My engines have sit longer than that, just hope I don't lose any, I like to take care of my stuff but I feel I should have oiled the from time to time.