The correct oil type for a Massey Ferguson 240 is 15w/40 or 10w/40 diesel engine oil with an API classification of CF-4 or higher. The oil should also meet or exceed Massey Ferguson specification M1144. If the tractor is equipped with a wet clutch, then a multi-grade oil such as 15w-30 or 10w-30 oil should be used. It is important to check the engine oil level on a regular basis, and to change the oil every 500-700 hours. Additionally, the hydraulic system requires hydraulic oil meeting Massey Ferguson specifications M1145. It is best to consult the owner’s manual for further instruction regarding oil type and maintenance.