Purpose and Specifications

LIQUI MOLY Pro-Line Diesel System Cleaner 5156 is a premium 500ml additive that deeply cleans your diesel engine's fuel system, injectors, valves, and combustion chambers. It removes tough deposits, eliminates diesel knocking, and restores smooth power for all diesel engines, including turbocharged ones with or without DPF filters. One can treats up to 70 liters of fuel, mixing automatically for easy use.

Key practical benefits:

• Boosts fuel efficiency and cuts exhaust smoke
• Prevents corrosion and minimizes wear for longer engine life
• Optimizes combustion to improve ignition and performance
• Reduces emissions to help pass smoke tests

Use it preventively every 10,000-20,000 km or yearly during inspections. For problems like rough idling or power loss, add during refueling and drive about 2,000 km to fully clean the system. Shelf life is typically 3-5 years when stored cool and dry.

When to Use / Replace?

Add this cleaner every service interval (around 12 months or 15,000 km) to keep your fuel system deposit-free, especially in modern common rail diesels running on low-quality fuel. Replace or re-treat if you notice black smoke, poor acceleration, or knocking—effects show after 2,000 km of driving. Safe for ongoing use up to operating temps of -20°C to 120°C in the fuel system.

FAQ

Can I use it in my DPF-equipped diesel? Yes, it's fully compatible and helps maintain DPF function by reducing emissions and deposits.

How soon do I see results? Benefits like smoother running and better MPG start after 500-1,000 km, full cleaning by 2,000 km.

Is it safe for daily drivers? Absolutely—highly economical for preventive maintenance every year or inspection.