My son and i use 20 or 25% Optifuel in all our nitros as for glow plugs i would buy a few you never know when a plug will pop(running an engine in can be hard on the plug) . OS8 are good all rounder plugs and reliable , We have used various other plugs but always end up going back to the OS8
After run oil is a really good idea ,After your finished running it for the day just drip a few drops down the plug hole and turn engine over a few times it really does help keep engine in good order π»