GD-401 Moly Treatment for gear oils is a specially formulated molybdenum disulfide gear oil additive designed for use in hypoid gear oils. This 401 formulation is made with molybdenum disulfide, mineral oil, and other additives and is engineered to enable maximum moly benefits. This product is ideal for final drive gear boxes as used on all Guzzi motorcycles, in particular when using mineral based oils. 8 ounce bottle treats 2 quarts of gear oil, which depending on model, will complete up to 10 rear drive gear oil changes, lasting most riders many years. Tip: For maximum benefit, always shake the bottle prior to dispensing because some settling will occur while the bottle is on the shelf.