Liqui Moly Catalytic System Clean fuel additive 300 ml — cleans injectors & protects catalytic converter, improves combustion

Liqui Moly Catalytic System Clean 300 ml is a fuel-additive treatment that cleans the fuel injection, combustion chamber and protects the catalytic converter from soot buildup up to about 2,000 km after application.

Designed for gasoline engines equipped with catalytic converters, this 300 ml bottle is a preventative, in-tank additive that mixes automatically with fuel to remove deposits, improve fuel combustion and reduce the risk of catalyst clogging. One bottle treats up to 70 liters of petrol and is suitable for turbocharged engines as well as naturally aspirated systems. Applied during refueling, it works as the engine runs — offering a maintenance step that targets injectors, valves and combustion residues without disassembly.

How does this product improve engine combustion?

The formula attacks carbon and soot deposits in the combustion chamber and on injector tips, promoting a more complete burn of the fuel-air mixture. Better combustion can lead to smoother idling and more consistent throttle response while the additive is active.

• Breaks down deposits on injectors and valves for cleaner spray patterns
• Reduces residual soot in the combustion chamber to improve burn
• Works in-tank so treatment happens continuously as you drive

Will it help protect my catalytic converter and for how long?

Yes — the product is formulated to prevent soot-related clogging of the catalytic converter by reducing the amount of particulate and carbon reaching the catalyst. The manufacturer states the effect can persist for up to 2,000 km after adding the 300 ml dose to the fuel tank.

• Prevents accumulation of soot that can block catalyst passages
• Suitable for catalytic converter-equipped gasoline engines
• Effect duration roughly up to 2,000 km under normal use

How and when should I use the 300 ml bottle?

Add the bottle directly to the fuel tank before or during refueling; the product mixes automatically with petrol, so no special tools or procedures are required. One 300 ml dose is calibrated for up to 70 liters of fuel, making it practical for both full tanks and partial fills within that volume range.

• Pour into the tank before or while refueling for automatic mixing
• One bottle treats up to 70 liters of petrol
• Can be used preventatively at regular service intervals or before long trips

Is it compatible with turbochargers and all gasoline engines?

Liqui Moly Catalytic System Clean is tested for use in turbocharged engines and is compatible with gasoline powerplants that have a catalytic converter. It is not intended for diesel engines or systems without a catalyst.

• Safe for turbocharged gasoline engines
• Formulated specifically for engines with catalytic converters
• Not designed for diesel engines or diesel particulate filters

Who is this for? This product is aimed at drivers and vehicle owners who want a straightforward preventative maintenance step to keep fuel systems and catalysts cleaner without workshop intervention. It suits motorists who refuel regularly, owners of older cars where deposit buildup is a concern, and anyone preparing a petrol vehicle for long-distance use. Use it as part of routine care to help maintain efficient combustion and reduce soot-related risks to the catalytic converter.