Purpose and Specifications

LIQUI MOLY Catalytic-System Clean is a fuel additive designed to protect and maintain your gasoline engine's fuel system and exhaust components. This 300ml bottle treats up to 70 liters of fuel and works by cleaning critical engine areas while preventing damage.

What it does:

• Protects the catalytic converter from soot buildup that reduces efficiency
• Cleans fuel injectors, intake valves, and the combustion chamber
• Improves fuel combustion for better engine performance
• Reduces fuel consumption and CO2 emissions
• Prevents corrosion in the fuel system from acid buildup
• Works in turbocharger engines and standard catalytic converter systems

How it works: The additive contains detergents and oxygen-releasing compounds that activate at high exhaust temperatures (above 400°C / 750°F). These break down carbon deposits and prevent them from re-accumulating on engine components.

Effectiveness: One 300ml bottle provides protection for up to 2,000 km of driving. The cleaning effect begins within one fuel tank and continues as you drive.

When to Use / Replace?

Preventive Use: Add one bottle every 15,000 to 30,000 km to maintain fuel system cleanliness and exhaust efficiency. This is especially recommended for city-driven vehicles where carbon buildup occurs faster.

Problem Solving: Use immediately if you notice reduced fuel economy, rough idle, or if your check engine light appears (such as a P0420 catalytic converter efficiency code).

Application: Simply pour the entire 300ml bottle into your fuel tank. It mixes automatically with gasoline—no special equipment needed. Best results occur during highway driving where sustained high temperatures activate the cleaning compounds.

Storage: Keep in a cool, dry place. The product is suitable for all gasoline engines equipped with catalytic converters.

Frequently Asked Questions

Q: Will this damage my oxygen sensors?
A: No. When used as directed, it will not harm oxygen sensors. Cleaner exhaust flow may actually improve sensor accuracy by reducing contamination.

Q: How often should I use this if my car runs fine?
A: For preventive maintenance, use one bottle every 15,000 to 30,000 km. Many mechanics recommend adding one bottle between each oil change to keep the entire fuel and exhaust system clean.

Q: Can I use this in diesel engines?
A: No. This product is formulated exclusively for gasoline engines with catalytic converters. Do not use in diesel vehicles.