Purpose and Specifications

The LIQUI MOLY 5128 Diesel Engine System Cleaner is a powerful 300 ml fuel additive designed to deeply clean your diesel engine's fuel system. It removes stubborn deposits from injectors, valves, and fuel lines for smoother fuel flow and better combustion. This cleaner protects against corrosion, boosts lubrication to cut wear on pumps and injectors, and ensures reliable performance in all diesel engines, including those with turbochargers, common rail systems, and diesel particulate filters (DPF).

One 300 ml can treats 35-75 liters of diesel fuel, making it perfect for regular maintenance. Add it every 2,000 km (1,200 miles) or during fuel filter changes to keep your engine running clean and efficient, reducing fuel use and emissions while extending component life.

When to Use / Replace?

Use LIQUI MOLY 5128 during routine maintenance, after fuel system repairs, or if you notice rough idling, poor acceleration, excess smoke, or higher fuel consumption. It's ideal for preventative care every 2,000 km or at inspection intervals. Shelf life is typically 3-5 years when stored in a cool, dry place away from direct sunlight (0-30°C). No need to 'replace' the additive itself - just add fresh doses as needed based on mileage.

• Prevents injector gumming and seizing for quiet, responsive driving
• Improves cold starts and power in low-sulfur diesel
• Safe for catalytic converters and DPF

Frequently Asked Questions

Can I use this in my modern diesel truck with DPF?
Yes, it's fully compatible and helps keep filters clean by optimizing combustion and reducing deposits.

How often should I add it?
For best results, every 2,000 km or with each tank fill-up during maintenance - one bottle covers up to 75 liters.

Will it improve fuel economy?
Yes, by cleaning the system and improving combustion, users see better mileage and lower emissions right away.