MAATSEN Engine Flush Cleaner 300 ml — 2-Pack Concentrated Treatment for Gas & Diesel Engines

MAATSEN Liquii Moly Engine Flush is a concentrated 300 ml cleaning fluid (2-pack) that loosens and suspends oil-soluble and insoluble deposits so they can be removed at the next oil change.

Keep your engine free of sludge, varnish and carbon build-up without disassembly — this two-bottle set is formulated to work with both gasoline and diesel engines and is compatible with engines that have toothed belts running in oil. Each 300 ml bottle treats up to 6 liters of engine oil, making it a compact, economical maintenance step before draining and refilling oil. It is not suitable for motorcycles with wet clutches.

How does this engine flush clean deposits without taking the engine apart?

The formula dissolves and suspends stubborn oil-soluble residues and non-soluble particles so they remain carried in the oil until the next drain. When you run the engine for a short period, the loosened contaminants circulate and are then removed with the used oil during the oil change.

• Concentrated 300 ml dose treats up to 6 liters of oil
• Works while the engine idles or runs under light load for a short interval
• Removes varnish, sludge and sticky residues from oil passages
• No need to dismantle engine parts for cleaning

Will this product harm seals, belts, or engine components?

Formulated to be safe with common sealing materials and compatible with engines that use an oil-bathed toothed belt, this flush avoids aggressive swelling or hardening of typical gaskets and seals. Still, follow the manufacturer’s usage directions and do not use in motorcycles with wet clutches.

• Does not attack standard elastomers and seals
• Safe for oil-immersed toothed belt drives
• Not recommended for wet-clutch motorcycle gearboxes
• Use as a pre-oil-change treatment only

How do I use MAATSEN Liquii Moly Engine Flush safely and effectively?

Pour one 300 ml bottle into the engine oil while warm but idle, then run the engine for the short time indicated on the product instructions to circulate the cleaner. After this brief run period, drain the contaminated oil and replace it with fresh oil and a new filter to capture loosened particles.

• Warm engine to normal operating temperature before adding
• Run engine for the recommended interval on the instructions
• Drain oil and replace the oil filter immediately afterward
• Each bottle is sized for engines with up to 6 liters of oil

What improvements can I expect after using this engine flush?

By cleaning oil passages and removing sticky residues, the engine and fresh oil can work with fewer contaminants, which helps restore more consistent oil flow and reduces abrasive particles in moving parts. The result is smoother operation and better potential for the lubrication system to perform as intended.

• Clears sludge that can block oil galleries and pickup tubes
• Helps fresh oil reach components more effectively
• Can reduce noise caused by restricted oil flow
• Supports longer service intervals when used as directed

Who is this for: MAATSEN Liquii Moly Engine Flush 300 ml (2 PACK) is suited for DIYers, independent mechanics and fleet operators who maintain gasoline or diesel cars and light commercial vehicles. It’s ideal when preparing for an oil change on engines up to 6 liters of oil, particularly if you suspect varnish, sludge or deposit buildup. Avoid use in motorcycles with wet clutches and always follow the vehicle manufacturer’s maintenance guidelines.