Tommy,

If your engine is a ball bearing engine, it's a good idea to put a few drops of oil in it after your done flying for the day, bushing engines are more tolerant of not oiling-they din't have steel ball bearings.
Alcohol in the fuel attracts water, the nitro can be acidic-not good for aluminum. Trans. fluid is good, Marvel Mystrey Oil is the best (IMHO). Available at your local xyz-mart.

Jetts