The most common type of power steering fluid used in Massey Ferguson 255 tractors is an all-purpose automotive power steering fluid, typically sold in an 11.2-ounce container. To fill the power steering system, first make sure that the power steering reservoir is empty by removing the plug and draining out any fluid. Once the old fluid has been removed, carefully clean the plug and screw it back into place. Use a clean cloth to ensure that the area around the power steering reservoir is free of dirt and debris. Next, remove the cap from the power steering fluid reservoir and add the recommended amount of fluid, which is generally between 1.6 and 2.6 quarts.