Changing the oil of a Ducati Monster 973 is a relatively simple operation, but it requires attention to detail. Start by placing the motorcycle on a central stand or a stable support to ensure good stability during the work. First of all, slightly heat the engine so that the oil becomes more fluid and flows more easily, but do not overheat it. Then, turn off the engine and let it cool slightly. Locate the oil drain plug, which is located at the bottom of the engine crankcase. Using an appropriate wrench, unscrew the plug and let the oil drain completely into a suitable container. Once the oil has been completely drained, replace the drain plug, making sure it is tightly secured to prevent leaks. At this point, take the new motor oil and make sure to use a type recommended in the owner's manual. Using a funnel, slowly pour the new oil into the engine through the designated opening, being careful not to overfill it. After adding the right amount, check for leaks from the drain plug. Once the operation is complete, start the engine and let it run for a few minutes, checking for any leaks and listening to the operation. Finally, remember to responsibly dispose of the used oil at authorized collection centers.