The oil recommendation for a 25 hp Massey Ferguson tractor will depend on the model year and the type of engine that is installed in it. Diesel engine models require 15W-40 synthetic diesel engine oil, while gasoline engine models require 10W-30 conventional oil or 10W-30 synthetic oil in mild climates. In cold climates, 10W-30 synthetic oil is recommended. Always refer to the tractor’s operator’s manual for the manufacturer’s specific recommendations as well as any additional oil requirements or specifications.