To determine the proper tractor transmission oil to use, owners should consult their owner’s manual or contact the manufacturer of the tractor or transmission. If neither of these are options, the owner can contact the seller of the tractor or a local equipment dealer or a mechanic, or search for the information online. Tractor owners can purchase manuals for many types of tractors on websites such as YesterdaysTractors.com.
Nearly all manual clutch transmissions need gear oil. The type of weather in which the tractor operates may determine the weight of the oil that is appropriate for use. Lower-weight oils tend to solidify in cold weather less than higher-weight oils. Using synthetic oils alleviates this concern since manufacturers formulate them to tolerate a wide range of temperature extremes.
Lubrizol manufactures a universal tractor transmission oil that it claims to be suitable for use by all types of farm tractors, combines and construction and truck tractors. The company also makes a Super Tractor Universal Oil for use as an engine oil, as well as for a transmission, wet brakes and hydraulic fluid. Universal tractor transmission/hydraulic oil is used in newer large equipment such as bulldozers and skid-steer loaders, where a hydraulic system and a gearbox operate in the same oil reservoir.