How to oil a cuckoo clock 

You'll have to remove the movement from the case, adding oil on only 1 side is bad for a clock

Remove the weights and pendulum. Take a photo of the inside of the clock, disconnect the bird door and remove the hands. Disconnect the bellows. Undo the two screws that hold the bellows on and pull them off their tacks. Remove the four movement mounting screws and lift unit out of the housing.

Every 2 years.

Yes