Liqui Moly Catalytic System Cleaner 300 ml (uncoloured) — removes carbon deposits, restores catalytic efficiency

LIQUI Moly 8931 Catalytic-System Cleaner is a 300ml additive formulated to clean deposits from the intake, combustion chamber and catalytic system without changing color.

This concentrated cleaner from LIQUI Moly targets carbon deposits, combustion residues and typical impurities that build up in the intake tract, combustion chamber and catalytic converter. Supplied in a 300 ml bottle, the uncoloured formula is designed for addition to fuel or dosing systems according to vehicle service instructions, helping restore flow and reduce the performance drag caused by deposits.

How does this cleaner improve engine and catalytic performance?

The formulation contains a blend of additives engineered to dissolve and loosen sediments and varnish-like deposits that accumulate over time. By clearing these deposits, the cleaner can help restore more consistent combustion and reduce the burden on downstream emissions components.

• Breaks down carbon and fuel residues in intake and combustion areas
• Helps maintain catalytic converter efficiency by removing obstructive deposits
• Suitable for periodic maintenance to complement mechanical cleaning

When and how should I use LIQUI Moly 8931?

Use this 300 ml bottle as directed by the vehicle maker or LIQUI Moly instructions—typically added to the fuel tank or dosing system before a run that will allow the cleaner to circulate. It is intended as a service product for routine maintenance rather than an emergency repair.

• Follow the vehicle handbook or product directions for dosing and method
• Best used before longer drives to ensure full circulation through the system
• Safe for use where manufacturer allows additive treatments; check compatibility

What are the product size and packaging details?

The cleaner is supplied in a compact 300 ml bottle that is lightweight and easy to store in a workshop or garage. The physical package dimensions and weight make it simple to handle during routine service tasks.

• Net volume: 300 ml per bottle
• Item package weight approximately 0.299 kg
• Package dimensions roughly 17.6 cm × 5.0 cm × 5.0 cm

Is the cleaner safe for my vehicle's systems?

LIQUI Moly develops additives to meet automotive materials and system requirements, but always confirm compatibility with your vehicle’s specifications. The uncoloured formula avoids staining, and the chemical blend is formulated for engine intake and catalytic components when used as directed.

• Uncoloured formulation to avoid staining fuel or system parts
• Designed for intake, combustion and catalytic-system deposits
• Do not exceed recommended dose; consult vehicle handbook for restrictions

Who is this for: LIQUI Moly 8931 Catalytic-System Cleaner is aimed at car owners, DIY enthusiasts and professional technicians looking to reduce deposit-related performance loss and support emissions system function. It's well suited for periodic maintenance of petrol engines and vehicles where additive treatments are accepted by the manufacturer, offering a compact, workshop-friendly option to help keep intake and catalytic components cleaner between more invasive services.

Ingredients

Catalytic-System Cleaner