Motul Engine Clean 300ml engine flush & oil additive — dissolves sludge, improves oil flow

Motul Engine Clean is a 300ml engine additive and flush that dissolves sludge and deposits to improve oil circulation and support smoother engine operation when used before an oil change.

Designed to be added to the crankcase prior to draining the oil, this 300ml treatment works with gasoline, diesel and hybrid engines — including turbocharged and naturally aspirated units. Its detergent-style formula helps loosen varnish, sludge and carbon residues from pistons, rings, lifters and oil galleries so contaminants can be removed during the oil change. Compatible with catalytic converters and diesel particulate filters, it’s intended as a routine maintenance step rather than a repair solution.

How do I use Motul Engine Clean safely and when should I apply it?

Pour the entire 300ml bottle into the engine oil before you drain the oil. Let the engine idle for about 15 minutes to allow the formula to work on internal deposits, then perform the normal oil and filter change to remove loosened contaminants.

• Add before an oil change — do not mix with coolant or fuel.
• Recommended idle dwell time: ~15 minutes; do not run at high load.
• Follow with a full oil and filter replacement to extract dissolved residues.
• Safe for catalytic converters and most emission system components.

What improvements can I expect after using this engine flush?

After treatment and an oil change, many users notice smoother idling, steadier oil pressure, and more consistent compression readings as varnish and sludge are removed. Results vary by engine condition, mileage and maintenance history; this product supports oil flow rather than restoring worn mechanical parts.

• Helps free piston rings and oil passages to support oil circulation.
• Can reduce build-up that contributes to uneven compression.
• May aid in stabilizing oil temperature by restoring flow paths.
• Not a substitute for mechanical repairs on worn components.

Is Motul Engine Clean compatible with my vehicle and emission systems?

The formula is formulated for broad compatibility across gasoline and diesel engines, turbocharged units and hybrid drivetrains. It’s formulated to be safe with catalytic converters and diesel particulate filters when used as directed, making it suitable for both older and modern vehicles.

• Suitable for gasoline, diesel and hybrid engines.
• Compatible with turbocharged and naturally aspirated engines.
• Designed to avoid harm to catalytic converters and DPFs when used properly.
• Not recommended as a treatment for blocked filters—service may still be required.

Who is this product for? Motul Engine Clean is aimed at vehicle owners and technicians who perform regular oil changes and want a proactive, low-effort way to remove internal deposits. It’s a practical choice for daily drivers, higher-mileage cars, motorcycles, and fleet vehicles where routine maintenance can prevent progressive oil-flow issues. If your goal is cleaner internal components, improved oil circulation, and better preparatory maintenance before inspections, this 300ml additive is a convenient step to include with each oil service. Avoid expecting it to reverse mechanical wear; instead, use it as part of a preventative care plan to prolong oil life and support long-term engine reliability.