The Liqui Moly Maintenance Service Kit - 136991 is a comprehensive kit of products designed to provide essential maintenance for a car. It includes six different items, each serving a specific purpose in maintaining the overall health and performance of a vehicle. The contents of the kit include an oil filter, an air filter, a fuel filter, a cabin air filter, a spark plug set, and an engine oil. These products work together to ensure that the car's engine is running smoothly and efficiently, while also keeping the air and fuel systems clean and free of debris. The kit is designed to be a convenient and cost-effective solution for regular car maintenance, providing all the necessary components in one package. It is suitable for a variety of car models and can help extend the lifespan of the vehicle by keeping it well-maintained.