Castrol Fuel System Cleaner - 12 fl oz | Cleans Entire Fuel System | Restores Fuel Economy | Safe for GDI, Traditional Injectors & Hybrid Vehicles

Restore your engine’s performance and fuel economy with Castrol Fuel System Cleaner. Whether you drive a modern GDI-equipped vehicle or a traditional gasoline engine, this evolved formula cleans fuel injectors and the entire fuel system in just one tank. By removing harmful carbon deposits, it helps improve throttle response, reduce emissions, and maximize MPG.

Safe for catalytic converters and oxygen sensors, this fuel system cleaner works seamlessly with ethanol-containing fuels and hybrid gasoline-electric vehicles. For best results, pour the entire 12 fl oz bottle into a nearly empty tank and refuel with up to 12 gallons of gasoline. A second treatment may offer added benefits for neglected systems.

Trust Castrol to keep your journey clean, smooth, and efficient—every time you hit the road.