The Liqui Moly Oil Change Kit 5W-40 - 137431 is a comprehensive kit designed for performing an oil change on a car. It includes all the necessary products to ensure a smooth and efficient oil change process. The kit contains five different products, which are not specified by brand name, but are specifically designed to service various parts of a car. These products include an oil filter, an engine oil, an air filter, a fuel filter, and a cabin air filter. The oil filter is responsible for removing impurities and contaminants from the engine oil, ensuring that the oil remains clean and effective. The engine oil is a high-quality lubricant that helps to reduce friction and wear on engine components, promoting smooth operation and extending the life of the engine. The air filter is responsible for filtering out dust, dirt, and other particles from the air that enters the engine, preventing damage and maintaining optimal performance. The fuel filter is designed to remove impurities from the fuel before it reaches the engine, ensuring that the fuel system remains clean and efficient. Lastly, the cabin air filter helps to purify the air that enters the car's interior, providing a cleaner and more comfortable driving experience. Overall, the Liqui Moly Oil Change Kit 5W-40 - 137431 is a comprehensive and essential kit for maintaining the health and performance of a car's engine and other vital components.