A microwave oven and a method of controlling the same, in which a cooking unit disposed in a cooking cavity is moved from an initial position to a cooking position. The automotive additive ingredient may be a fuel additive ingredient such as a detergent. The tubular portion is formed such that the diameter thereof is larger than the inner diameter of the inner threaded portion of the screw member. The installation adapter may include first and second adapter members that secure to the fuse to provide contacts having an appropriate spatial relationship to engage the non-standard mounting.