Generic Catalytic System Cleaner 2-Pack (2×300 ml) Uncoloured — Fuel-through carbon deposit remover

Liquii Moly 8931 Catalytic-System Cleaner is a 300 ml, uncoloured fuel-system additive formulated to loosen deposits in the intake, combustion chamber and catalytic system — sold here as a convenient 2-pack.

Keep your exhaust-treatment components operating more freely by using a targeted cleaner designed for modern engines. This Liquii Moly 8931 formula works through the fuel/combustion cycle to help dissolve carbon residues and other sediments that can accumulate on catalysts and downstream parts. The product arrives in two 300 ml bottles, each compact and easy to store or carry for scheduled maintenance or occasional tune-ups.

How does this cleaner reach and treat the catalytic system?

The 8931 additive is introduced into the fuel stream or intake where it travels through combustion to reach the catalytic converter. During normal operation the active ingredients help break down deposits and leave behind fewer residues, supporting more consistent exhaust flow and sensor response.

• Injects via fuel tank or intake depending on application instructions
• Active blend designed to survive combustion to the catalyst area
• Targets carbon and soot deposits on catalyst surfaces
• Works during regular driving — no special tools required

What results can I reasonably expect after using it?

Results vary by vehicle condition and driving patterns; typical effects include reduced deposit buildup, potentially improved exhaust sensor readings, and easier catalyst operation. This cleaner aims to support system cleanliness rather than promise specific performance gains.

• Cleaner catalytic surfaces and fewer combustion residues
• May help stabilize oxygen sensor and emission-related readings
• Supports longer intervals between deep-service cleanings
• Best used as part of a maintenance routine, not a one-time fix

How do I use the 300 ml bottle safely and effectively?

Follow the vehicle manufacturer’s guidance and the product instructions on the label. Typically one bottle is added per recommended fuel volume or applied before a period of varied driving to allow the active chemicals to circulate and act on deposits.

• Read the label instructions and safety precautions before use
• Add one 300 ml bottle according to the stated fuel or intake procedure
• Drive the vehicle through mixed conditions to expose the catalyst to the treatment
• Store unopened bottles upright in a cool, dry place

Are there any compatibility or safety notes I should know?

This cleaner is formulated to be broadly compatible with gasoline engine systems and catalytic converters, but avoid mixing with other strong additives unless specified. Handle as a chemical product: avoid skin contact, keep away from open flames, and follow local disposal rules for leftover liquid or empty containers.

• Designed for gasoline engine catalytic systems in passenger vehicles
• Do not combine with incompatible cleaning agents
• Use personal protective equipment if pouring or transferring liquids
• Dispose of empty bottles per local hazardous-waste guidance

Who is this for: This 2-pack of Liquii Moly 8931 Catalytic-System Cleaner is aimed at DIY vehicle owners, independent mechanics, and fleet managers who perform routine fuel-system maintenance and want a compact, ready-to-use product to help reduce catalytic and combustion-chamber deposits. It suits drivers seeking preventive upkeep or those noticing mild exhaust-related irregularities, and it pairs well with regular servicing and diagnostic checks.