Over time and miles, your car might start to slow down. It might not accelerate as quickly as it once did; the engine ...

This booster can also clean your fuel injectors and increase your engine’s efficiency. One bottle of this K&N booster can treat up to 18 gallons of fuel. STP Octane Booster – $3.97 (50% off) ...

Thanks to MOMSRFUN for sending in this tip about STP's Facebook promotion. Become a fan of their page then click the coupon tab to download a $2 off printable coupon good on any STP Product. You ...

Both STP Fuel Injector Cleaner and Diesel Injector Cleaner are priced at just £5.49 for a 250ml bottle treatment lasting 3,000 miles, are suitable for engines of all types and ages, safe for catalytic ...

Sea Foam is most useful in older engines where deposits have built up or in GDI (Gasoline Direct Injection) engines, where the fuel is injected directly into the cylinders.

Fuel injector cleaners claim to help your engine run smoother and more efficiently. We've put together a list of some of the top over-the-counter EFI cleaners you can buy.

STP Ultra 5-in-1 Fuel System Cleaner and Stabilizer – $11.97. $11.97 at Amazon. Key Features. Suitable for turbocharged, ... Is fuel injector cleaner good for newer cars?