A funnel assembly used for adding motor oil to cars or motorcycles is revealed. The funnel assembly includes a main body, a first sleeve, an extension tube, a second sleeve and a cover. The main body is connected to the first sleeve and the first sleeve is assembled with the extension tube. The extension tube is connected to the second sleeve and the second sleeve is assembled with the cover. The first sleeve and the extension tube can be assembled with each other toward different directions and so do the second sleeve and the cover. Thereby the funnel assembly can be applied to and mounted into oil fill holes at different positions of various cars.