if you are talking about the seaform deep creep or the engine cleaner yes it does work, just put 1/4 of the bottle through he vacuum line that is connected tot he PCV valve while the car is running and rpm on at least 2000, switch off the car and start it back in 15mins will be hard to start and a s#!t load of smoke but after that will definitely feel the difference smooth idle, also pour 1/4 of it to a full gas tank will clean the injectors and the pump. i use it every year on my car,