I use two different types of Lubricant. First is the 'RCLube-XP' which is a white lithium grease for plastic gears in the remote controlled word. I use this to put a thin layer on the gears of our trains. Works great and is not messy. For the shafts that are within the motors themselves I use this 'Pin Point Lubricator' which I find great because with the syringe type needle you can get a very tiny drop of lubricant into a small space.
