If you mean commercial recycling then some companies are there which pickup that used oil from restaurants and convert it into fuel.
Ever came across a car whose smoke smells like french fries ? So you take your oil to that restaurant and put it in their oil recycling bin which is kept outside for the whole neighborhood to dump their cooking oil in it. They would not mind because they get paid for that oil by the gallons.
Here, you can make your own biofuel it is so very easy: 
Recycling Waste Vegetable Oil - Easy?