To change the engine oil in a Massey Ferguson 135, you will need a drain pan, oil filter, and the oil that is recommended for your equipment. 1. Start the engine and let it idle for about 5 minutes to warm up the oil. 2. Put the drain pan at a flat surface and under the oil drain plug located at the side or bottom of the engine block. 3. Turn the plug in a counterclockwise direction and remove it. 4. Allow all the oil to drain into the drain pan. 5. Replace the oil drain plug and tighten it. 6. Remove the old oil filter. 7. Wipe the oil filter mount with a clean cloth. 8. Apply a light coat of oil to the filter gasket, and then install a new oil filter. 9. Refill the engine with new oil, and use the recommended type for your equipment. 10. Check that the level of oil is between the two marks located at the dipstick, and add if necessary. 11. Start the engine and let it idle for a few minutes, then check the oil level again. 12. Dispose the used oil properly.