Purpose and Specifications

LIQUI MOLY 1878 Diesel Fließ-Fit K is a premium fuel additive designed to clean and protect your diesel engine's fuel system. This 1-liter bottle treats up to 300 liters of diesel fuel at a 1:300 ratio, keeping injectors clean, boosting lubrication to cut wear on pumps and injectors, and raising cetane for smoother starts and quieter running. It prevents corrosion, reduces fuel use, and lowers emissions while working safely with turbochargers, catalytic converters, and DPF filters.

• Cleans deposits from injectors, valves, and combustion chambers for better power and efficiency
• Boosts lubrication to protect against wear in low-sulfur fuels
• Improves combustion for easier cold starts and less noise
• Extends engine life by stopping gumming and seizing

Shelf life is 4 years unopened when stored in a cool, dry place between 0°C and 30°C.

When to Use / Replace?

Add every 2,000 km (1,200 miles) for ongoing protection and peak performance, or use continuously with every tank. Ideal for low-sulfur diesel to maintain lubrication. For storage, mix 1% into fuel to preserve the engine up to 12 months. Replace the additive bottle once opened within 2 years or if fuel smell develops.

Frequently Asked Questions

Is LIQUI MOLY 1878 safe for all diesel engines?
Yes, it's suitable for all diesel engines, including those with turbochargers, catalytic converters, and DPF filters.

How much fuel does one 1-liter bottle treat?
One liter treats up to 300 liters of diesel at the recommended 1:300 ratio, perfect for multiple tanks.

Can I use it in cold weather?
Absolutely, it improves cold starts by raising cetane and flows well down to 0°C operating temps.