MAATSEN Liquii Moly Pro-Line Engine Flush 500 ml — 2-Pack, dissolves sludge, seal & catalyst safe

MAATSEN Liquii Moly Pro-Line Engine Flush (500 ml) — 2-pack is a fast-acting detergent additive formulated to dissolve sludge and deposits inside four-stroke gasoline and diesel engines prior to an oil change.

This concentrated engine flush is designed to loosen varnish, carbon residues and other contaminants that build up in oil galleries, on piston rings and inside the crankcase over time. Compatible with all commercial engine oils and catalytic converters, the formula isolates solid particles and liquid impurities so they can be removed during the drain-and-fill service. Using the flush before replacing oil and filter helps restore smoother oil flow and supports the oil’s lubricating function without harming seals or engine materials.

How does this engine flush work during an oil service?

The product is added to the existing engine oil and left to circulate while the engine idles for a short interval. Solvent and detergent ingredients break down deposits and suspend them in the oil so they exit with the drained fluid. After draining, the trapped contaminants come out with the old oil and are caught by the new filter and replacement oil.

• Add to warm engine oil; run at idle for 10 minutes
• Detergents dissolve sludge and lacquer into the circulating oil
• Draining removes suspended contaminants and prevents redeposition
• Follow with oil filter change and fresh engine oil refill

Is the formula safe for my engine’s seals and emissions systems?

Yes — the formulation is neutral toward common sealing materials and engineered to protect uncoated metal surfaces from corrosion. It is formulated to be compatible with catalytic converters and will not interfere with emissions control components when used according to instructions.

• Seal-friendly: no aggressive swelling or shrinkage of rubber parts
• Catalytic-converter compatible when used as directed
• Protects uncoated metal surfaces from corrosion during treatment

Which engines can benefit from this MAATSEN Liquii Moly flush?

It works with all four-stroke gasoline and diesel engines, making it suitable for passenger cars, light commercial vehicles and many workshop applications. The 500 ml dose is sized to treat a standard crankcase volume; the two-pack provides service for multiple vehicles or two successive services.

• Designed for four-stroke gasoline and diesel engines
• Compatible with conventional, synthetic and blended engine oils
• 500 ml dose per treatment; two bottles included for extra coverage

How should I use the product for best results?

For effective cleaning, add the entire 500 ml bottle to warm engine oil before the oil change, then run the engine at idle for roughly ten minutes. After this short circulation, turn off the engine, allow a brief cool-down, then drain the oil, replace the oil filter and refill with fresh engine oil to complete the service.

• Add one 500 ml bottle to warm oil; do not overfill
• Run engine at idle for approximately 10 minutes only
• Drain oil, replace filter, and refill with fresh oil immediately after

Who is this for? This MAATSEN Liquii Moly Pro-Line Engine Flush 500 ml — 2-pack suits DIY mechanics, independent workshops and fleet managers who want a reliable pre-oil-change cleaning step. It’s ideal for vehicles showing sluggish oil circulation, mild sludge buildup or long service intervals, and for anyone preparing an older engine for fresh oil to restore smoother operation. Always follow the product label and your vehicle manufacturer’s service recommendations when performing maintenance.