Mercedes-Benz USA lists 166-320-01-14, also shown as 1663200114, as an oil reservoir. The official catalog page identifies the manufacturer as Mercedes-Benz and labels the item as a new oil reservoir. The available page includes a product image associated with the part number and places it in the Mercedes-Benz parts catalog. It does not verify reservoir capacity, material, fittings, fluid type, or a complete vehicle application for this listing, so those details are omitted. Use both the hyphenated and compact numbers when comparing catalogs, and confirm the vehicle and hydraulic-system configuration before ordering.