The Massey Ferguson 35 gas engine requires 10W-30 multi-viscosity oil to ensure proper lubrication of engine components. The oil should be changed every 500 hours or annually, whichever comes first. Be sure to use oil that meets or exceeds the quality standards set by the American Petroleum Institute (API) as recommended by your tractor engine manufacturer. Using oil of lower quality could cause engine damage. Also, use a diesel engine oil if the ambient temperature is expected to be below 32°F/0 °C. In addition, it’s recommended to use a two-quart oil sump to maintain engine lubrication in the event of sudden cold weather or any other type of interruption.