Motul Engine Clean engine flush & oil additive 300ml — dissolves sludge, restores oil flow and engine responsiveness

Motul Engine Clean is a 300ml additive you pour into old oil to dissolve sludge, varnish and deposits so they can be drained away at your next oil change.

Engine deposits build up gradually and reduce oil circulation, compression and responsiveness. Motul Engine Clean is formulated for 4-stroke gasoline and diesel engines — including turbocharged units and engines with emissions hardware — to break down contaminants before an oil change. Used by professionals and enthusiasts alike, it helps restore internal cleanliness without aggressive solvents or complicated procedures.

How does Motul Engine Clean improve engine performance?

By loosening and suspending sludge, varnish and carbon deposits inside the lubrication circuit, Motul Engine Clean helps restore oil flow and reduce internal friction. Cleaner oil passages and freed piston rings often lead to more consistent compression, smoother idling and improved throttle response.

• Dissolves deposits on piston rings, lifters and oil galleys to restore movement.
• Promotes better oil circulation to reduce localized wear and heat.
• Helps recover lost responsiveness from engines with long service intervals.

Is Motul Engine Clean safe for my catalytic converter, DPF or turbo?

Motul designed this flush to be compatible with emissions systems and turbochargers when used as directed before an oil change. The formula disperses contaminants into the old oil for removal, avoiding harsh solvents that can harm sensitive components.

• Safe for catalytic converters and diesel particulate filters when drained and replaced with fresh oil.
• Non-aggressive detergents minimize risk to turbo oil lines and seals.
• Recommended for both modern and older 4-stroke engines, including hybrids.

How do I use Motul Engine Clean during an oil change?

Using Motul Engine Clean is a simple two-step service addition before you drain the oil. Pour the entire 300ml dose into the warm engine oil, run the engine at idle for roughly 15 minutes, then drain the contaminated oil and fit a new filter before refilling with fresh oil.

• Add to warm engine oil immediately before draining to maximize deposit suspension.
• Idle ~15 minutes to allow the formula to circulate and loosen residues.
• Drain oil, replace filter, and refill with the correct fresh oil specification for your engine.

What measurable benefits can I expect after using this engine flush?

Results depend on engine condition, but many users notice reduced idle roughness, steadier compression and smoother acceleration after one treatment. Regular use at oil changes helps maintain oil flow, can support fuel economy, and reduces the chance of deposit-related wear.

• Improved oil circulation and reduced risk of oil starvation in restricted galleries.
• Potential for more stable compression and fewer misfires related to sticky components.
• Cleaner engine internals preserve new oil performance and prolong service intervals.

Who is this for: Motul Engine Clean is intended for vehicle owners, motorcycle riders, powersports enthusiasts and professional techs who want an easy, effective way to remove internal deposits prior to an oil change. It’s appropriate for daily drivers, high-mileage vehicles, performance engines and mixed fleets that run gasoline or diesel 4-stroke powerplants and prefer preventative maintenance to costly repairs.