Liqui Moly Diesel Purge diesel additive 500 ml — concentrated cleaner for injectors & pumps

LIQUI MOLY Diesel Purge is a concentrated 500 ml diesel additive designed to clean and restore diesel injection components for smoother running and reduced deposits.

Designed for modern and older diesel engines, this universal-fit diesel fuel cleaner targets deposits in injectors, pumps, and combustion chambers. It helps return proper spray patterns and combustion consistency by dissolving varnish, soot and lacquer-like residues that build up from normal fuel use. Easy to add at the fuel tank before refueling, the formulation is intended for routine maintenance or targeted cleaning treatments to improve drivability and fuel system operation.

How does Diesel Purge clean the injection system?

Diesel Purge contains solvent carriers and detergents that dissolve and remove carbonaceous and varnish deposits from injectors, pumps and intake passages. As it mixes with fuel, the additive reaches high-temperature zones to break down residues that impair atomization and spray pattern. Regular use helps maintain consistent fuel delivery and combustion.

• Solvent-based formula dissolves lacquer and soot buildup
• Detergents disperse particles to prevent re-deposition
• Works through the fuel line to reach injectors and pumps

How do I use this 500 ml bottle correctly?

Application is straightforward: add the entire 500 ml bottle to the fuel tank before filling with diesel to ensure proper dilution and distribution. One treatment is suitable for a full tank of fuel; follow the product label for specific dosing based on tank volume. Use as a maintenance dose every few thousand kilometers or as a focused cleaning treatment when injection-related symptoms appear.

• Pour full bottle into fuel tank prior to refueling
• One bottle treats a full diesel tank — check label for exact volumes
• Repeat at recommended service intervals or when cleaning is needed

What improvements can I expect after using it?

After treatment, many users notice smoother idling, fewer hesitation events and more consistent throttle response as injectors regain proper spray characteristics. Fuel consumption may stabilize as combustion quality improves and deposits no longer disrupt fuel metering. Results can vary depending on deposit severity and engine condition, and heavier contamination may require repeated treatments.

• More consistent idle and throttle response
• Potential reduction in smoke and misfires linked to poor atomization
• Helps stabilize fuel consumption by restoring combustion efficiency

Is Diesel Purge compatible with my vehicle and other additives?

LIQUI MOLY Diesel Purge is formulated as a universal-fit diesel cleaner compatible with diesel fuels and most diesel engines, including those with common-rail and mechanical injection systems. It is designed to work alongside routine fuel treatments but avoid mixing with unknown aftermarket chemicals; when in doubt, consult your vehicle or service manual or contact LIQUI MOLY customer support.

• Suitable for modern common-rail and older mechanical systems
• Works as a standalone cleaning treatment or part of maintenance
• Avoid combining with unverified additives without guidance

Who is this for? Drivers and technicians who want a practical, easy-to-use solution for diesel injection deposits will find LIQUI MOLY Diesel Purge useful. It suits private vehicle owners seeking to maintain drivability and efficiency, fleet managers aiming to reduce downtime related to fuel-system deposits, and workshops offering maintenance services. While effective for routine upkeep, severely worn or mechanically damaged injection components may still require professional inspection or replacement.