Barry good to hear from you, welcome back. All these questions about bearings, after run oil should be addresed to the guys who fly all the time and burn alot of fuel. Barry, gjeffers, and others. Nitro-methane is the corisive ingredient, in fuel, (which if I remember increased the compression and burning temperture), which is why running engine alittle rich is a good idea. Also keep in mind the flying you do with the UCD. Vertical flight, harriers, hovering all put the engine in a slow moving, non-cooled condition with the front bearing getting very little lubrication. yiks! People that I have talked to at our field that fly normally(boring also) don't seem to have as many bearing problems as 3-D'rs do.

Doug[8D]