Lucas Oil 10013 Fuel Treatment - 1 Gallon (Pack of 4) | Engine Cleaner & Performance Booster | Improves MPG & Reduces Emissions for Cars, Trucks & Diesel Engines

I'm impressed! I didn't expect this to work, but I actually noticed a few things:- Car starts up much faster (less "cranking" required to start the engine)- Feels a bit smoother and more powerNot sure if its placebo but it definitely seems like it works! Considering this is so cheap, I will definitely buy it again.