 SYNC: The oil can makes the wrong noise when its being used. The  "doonka" noise heard is the sound of an oiler which looks like a  hemisphere (curved side up) with a flexible nozzle coming out of the  top. The "doonka" noise is from the pressing of the flexible bottom  of the oil can to get oil out. The can used in the film is a newer  version with a lever used to piston the oil out of the can. This  type of oiler makes little noise, and the noise it does make is  nothing like that of the older can.