Generic Liqui Moly Catalytic System Clean fuel additive 300 ml — removes soot, protects catalytic converter

Liqui Moly Catalytic System Clean 300 ml is a fuel additive designed to remove soot deposits, protect catalytic converters, and improve combustion in gasoline engines.

This concentrated 300 ml formula is intended as a preventive treatment for petrol engines equipped with catalytic converters. Added directly to the fuel tank, the product disperses automatically with the fuel to clean injectors and combustion chambers, reduce deposit build-up and help maintain efficient exhaust after-treatment components. One bottle treats up to 70 liters of petrol and the cleaning effect is typically noticeable for around 2,000 km of driving.

How does this additive protect the catalytic converter?

The formula targets soot and combustion residues that can clog catalyst channels, helping preserve conversion efficiency and flow. By reducing accumulation on the catalyst, it supports more stable exhaust backpressure and consistent emissions control.

• Breaks down soot and carbon deposits before they adhere to the converter.
• Helps maintain catalyst flow and reduces risk of premature clogging.
• Compatible with catalytic systems—tested for use with turbocharged engines.

Will it improve engine combustion and fuel economy?

Cleaning injectors and the combustion chamber promotes a more even fuel spray and better fuel/air mixing, which can improve combustion stability. While results depend on engine condition, a cleaner combustion process can lead to reduced fuel consumption and lower CO2 output compared with a heavily sooted engine.

• Removes injector and chamber deposits that disrupt spray patterns.
• Supports more complete fuel burn and smoother idling and acceleration.
• May reduce fuel use when applied preventively on regular service intervals.

How and when should I use the 300 ml bottle?

Add the product directly to the fuel tank at any time—the liquid mixes automatically with petrol during filling and driving. One 300 ml bottle treats up to 70 liters of gasoline; use as a periodic preventative treatment rather than a one-time repair for severely clogged systems.

• Add one bottle to the tank before a long drive or as part of routine maintenance.
• Suitable for mix-and-go; no special tools or procedures required.
• Effect typically lasts for up to about 2,000 km after application.

Is this safe for modern engines and exhaust components?

The formulation is designed for petrol engines with catalytic converters and has been evaluated for compatibility with turbos and catalyst systems. It is intended as a preventive care product; engines with severe contamination may need mechanical cleaning or professional inspection.

• Suitable for gasoline engines equipped with catalysts.
• Tested for use with turbochargers and catalytic converters.
• Not a substitute for required mechanical maintenance when damage is present.

Who is this for? Liqui Moly Catalytic System Clean 300 ml suits vehicle owners and technicians seeking a simple preventive treatment to keep petrol engines and exhaust after-treatment components running clean. It's aimed at drivers who want to reduce deposit build-up, support fuel economy, and help extend the functional life of catalytic converters—especially useful before long trips or as part of scheduled maintenance for modern gasoline cars.