Make it glide more smoothly and keep rust off of the chain and gears the chain touches.
to reduce wear and unwanted friction
because they give you fiber which helps your digestive system flow easier, its like oiling your bicycle chain to help it ride smother
when ever you feel like it or when ever it looks like oiling
Farmed and Dangerous - 2013 Oiling the Food Chain 1-1 was released on: USA: 17 February 2014
a chain
The chain is normally steel and regular oiling will reduce rust and worn linkage
Bicycle chain
no it is a lever
bicycle
pulley
It protects the chain from rain and road grime and it protects your trouser legs from chain gunk.
The chain is wrapped around a cogwheel, which could be described as a pulley.
A deraileur is the device that shifts the chain to different cogs on a bicycle.