LIQUI MOLY Diesel Particulate Filter Cleaning Spray Gun for BMW, Audi, Mercedes-Benz, Porsche, Volkswagen, and Dodge Diesels (2005–2025)

Built as a 1-liter pressurized container, the LIQUI MOLY diesel particulate filter spray gun applies cleaning fluid and flush during DPF cleaning on the BMW, Audi, Mercedes-Benz, Porsche, Volkswagen, and Dodge diesels in the fitment table. The body is powder-coated aluminum. It connects to a shop air line through a standard compressed air fitting, and a check valve on the gun stops the fluid from flowing back. A diesel particulate filter traps soot from the exhaust. Once ash and soot build up beyond what regeneration can burn off, the filter needs cleaning or replacement. This gun is made in Germany, like the cleaning chemicals it is paired with.

The LIQUI MOLY DPF spray gun carries a 24-month or 24,000-mile warranty.

The spray gun is one part of a LIQUI MOLY cleaning system. LIQUI MOLY specifies it for use with part 20110 DPF Cleaning Fluid, part 20112 DPF Cleaning Flush, and part 7945 DPF Cleaning Wand Kit. None of those items come with the gun, so plan to order the fluid, the flush, and the wand kit separately if you do not already have them. The gun is reusable shop equipment, so one unit serves every diesel in the fitment range, from BMW xDrive35d and xDrive28d models to Mercedes-Benz Bluetec and Sprinter vans. LIQUI MOLY has made its own additives at its Ulm-Lehr, Germany, head office since 1978.

Technical Details

• Manufacturer: LIQUI MOLY
• Part number: 7946
• Product: diesel particulate filter spray gun
• Capacity: 1 liter
• Container: powder-coated aluminum
• Standard compressed air connection with check valve
• Used with parts 20110, 20112, and 7945
• Made in Germany
• Warranty: 24 months or 24,000 miles

Installation & Tuning Notes

Connect the gun to a shop compressed air supply through its standard connection. Use it with LIQUI MOLY DPF Cleaning Fluid 20110 first, then DPF Cleaning Flush 20112, applied through the 7945 wand kit.

Common Questions

Does the spray gun include the cleaning chemicals?
No. The fluid 20110, the flush 20112, and the wand kit 7945 are sold separately.

How much does the container hold?
It holds 1 liter.

PMB Performance carries the full LIQUI MOLY DPF cleaning set for diesel owners and shops.

Fitment & Compatibility

See the fitment table below for the diesel models this tool is matched to. Make sure your vehicle has a diesel engine with a particulate filter. Send us your VIN and we will confirm fit.