The Liqui Moly Diesel Oil Change Kit is a comprehensive set of products designed to assist with the maintenance of a car's diesel engine. It includes the necessary components to complete an oil change, specifically using a 5W-30 oil. The kit contains three key items, including an oil filter, oil drain plug, and a specific amount of oil. The oil filter is responsible for removing impurities and contaminants from the engine oil, ensuring that it remains clean and effective. The oil drain plug allows for easy and efficient drainage of the old oil during the oil change process. Lastly, the included oil is specifically formulated for diesel engines and has a viscosity of 5W-30, making it suitable for a wide range of temperatures and driving conditions. This kit is an essential tool for maintaining the performance and longevity of a diesel car's engine.