The best way to make your car perform better [SOLVED]

Thanks for the question Shannon. As far as using Sea Foam to help a used car, adding Sea Foam to fuel and oil systems will go a long way. Here are two helpful tips: When adding to fuel, add to tank when low to increase the cleaning concentration – this will work to clean fuel passageways and upper engine areas. In oil, add half a can to the crankcase every interval – this will work to liquefy heavier crankcase residue so everything can drain away each time you change your oil.  Improvements are only possible [or noticed] when an engine suffers from lost power, lost MPG, poor idling or acceleration. Good luck with your ‘new’ used car!