Liqui Moly Diesel Purge Injection Cleaner — 2 x 500 ml (1 L) concentrated diesel injector cleaner for soot & varnish

Liqui Moly Diesel Purge Injection Cleaner is a concentrated 500 ml additive (sold as a set of 2) formulated to clean diesel injector and combustion deposits when added to the fuel tank.

Designed for modern diesel engines, this concentrated formula helps remove varnish and soot deposits that build up in injectors, combustion chambers, and intake systems. It is supplied as two 500 ml bottles, giving a total of 1 liter of treatment—enough for multiple service intervals depending on tank size and contamination level. The product is for use as a preventive and corrective maintenance additive to support smoother idling, more consistent spray patterns, and better fuel combustion characteristics when combined with regular servicing.

How do I use Liqui Moly Diesel Purge Injection Cleaner safely and effectively?

Add the recommended dose to the fuel tank before refueling so the cleaner mixes evenly with the diesel fuel. For precise dosing, follow the instructions printed on the bottle; do not exceed recommended concentrations. Avoid direct skin contact—gloves are not included with the product—and keep away from open flames and hot engine parts during pouring.

• Dosage: follow bottle directions (typically one 500 ml bottle per tank size guidance).
• Timing: add before filling the tank for best mixing and distribution.
• Safety: use gloves and work in a well-ventilated area; store away from heat.
• Compatibility: suitable for diesel engines—check manufacturer guidance for specific vehicle models.

What performance benefits can I expect after treatment?

Regular use can help reduce injector deposits and restore a more uniform spray pattern, which contributes to steadier idling and efficient fuel use. Results depend on the degree of contamination and overall engine condition; severe mechanical issues will not be resolved by an additive alone. Many users notice smoother running and more consistent throttle response after treatment combined with routine maintenance.

• Cleaner injectors and combustion spaces for better atomization.
• Potential improvement in idle stability and responsiveness.
• Can assist in reducing visible smoke from incomplete combustion.
• Works as part of a regular maintenance schedule—not a cure-all for mechanical faults.

Will this product affect emissions systems or require special care?

Liqui Moly formulates its diesel additives to be compatible with common exhaust after-treatment systems, but proper dosing is important. Using the product as directed should not harm diesel particulate filters (DPF) or catalytic converters; however, always consult your vehicle handbook or dealer if you have a manufacturer-specific maintenance policy. If a DPF is already heavily clogged, professional cleaning may still be necessary.

• Formulated for compatibility with typical diesel after-treatment systems.
• Safe when used at recommended concentrations; do not overdose.
• Not a replacement for mechanical DPF cleaning if the filter is severely blocked.
• Check vehicle warranty or service requirements if concerned.

Who is this for? Liqui Moly Diesel Purge Injection Cleaner (500 ml, set of 2) is aimed at diesel vehicle owners and fleet operators who want a proactive maintenance additive to help manage injector and combustion chamber deposits. It suits passenger cars, light commercial vehicles, and those who perform their own routine fuel system upkeep. If you run diesel regularly and want an industry-respected additive to support cleaner combustion and more consistent engine behavior between service intervals, this concentrated twin-pack offers a convenient supply for multiple treatments.