LIQUI MOLY Common Rail Additive 250ml

What Is LIQUI MOLY Common Rail Additive?

LIQUI MOLY Common Rail Additive is a specialised diesel fuel additive developed for modern high-pressure diesel injection systems, particularly Common Rail and Pump-Injection technology.

Modern diesel engines depend on highly precise injectors to deliver the correct amount of fuel at the right time. Deposits, insufficient lubrication and corrosion can affect injector performance and fuel-system durability. This additive combines cleaning agents with lubrication improvers to help maintain high-precision injectors and protect the entire fuel system.

It is particularly formulated for diesel engines using low-sulfur diesel fuel, where additional lubrication support can be beneficial.

How Does Common Rail Additive Work?

LIQUI MOLY Common Rail Additive is poured directly into the diesel fuel tank, where it mixes automatically with the fuel.

As the treated diesel passes through the injection system, its cleaning components help remove deposits and maintain injector cleanliness. Its lubrication improvers increase the lubricating properties of the fuel, helping minimise wear in high-pressure fuel-system components.

The formulation also increases the cetane number of diesel fuel. Improved ignition performance supports better combustion behaviour, especially when the engine is cold.

Key Features and Benefits

• Specially developed for Common Rail diesel injection systems.
• Suitable for Pump-Injection technology.
• Helps clean the entire diesel fuel system.
• Maintains high-precision injector operation.
• Helps prevent injector needles from sticking or gumming up.
• Improves diesel fuel lubricity.
• Helps protect fuel pumps and injectors against wear.
• Provides corrosion protection.
• Increases the cetane number.
• Supports better cold-start combustion.
• Helps improve engine running quality.
• Helps reduce soot formation.
• Supports diesel particulate filter protection.
• Suitable for low-sulfur diesel fuels.
• Tested for use with turbochargers and catalytic converters.

Suitable Applications

LIQUI MOLY Common Rail Additive is designed for diesel engines equipped with high-pressure fuel-injection systems.

Typical applications include:

• Common Rail diesel passenger cars.
• Common Rail diesel SUVs and 4×4 vehicles.
• Pump-Injection diesel engines.
• Turbocharged diesel engines.
• Diesel vehicles equipped with DPF.
• Modern high-pressure diesel injection systems.
• Compatible commercial diesel vehicles.

It is especially suitable for preventive fuel-system maintenance in Common Rail and Pump-Injection engines. The product is designed for diesel fuel and should not be used in petrol engines.

Product Specifications

Application and Dosage

LIQUI MOLY Common Rail Additive is added directly to the diesel fuel tank.

Recommended application:

1. Confirm that the product is suitable for your diesel engine.
2. Open the vehicle’s diesel fuel tank.
3. Pour the 250ml contents directly into the tank.
4. Refuel if necessary.
5. The additive mixes automatically with the diesel fuel.

One 250ml can is sufficient for up to 75 litres of diesel fuel. The recommended mixing ratio is 1:300.

For keeping injectors clean and providing corrosion protection, LIQUI MOLY recommends adding the product to the passenger vehicle’s diesel tank approximately every 2,000km.

The improvement in ignition performance and fuel lubricity is intended for continual use with low-sulfur diesel fuel.

Why Is Common Rail Fuel-System Protection Important?

Common Rail systems operate at high fuel pressures and use precision-engineered injectors. These components require clean fuel and suitable lubrication to maintain reliable operation.

Deposits can interfere with injector performance, while inadequate lubrication can contribute to wear in fuel pumps and other high-pressure components.

LIQUI MOLY Common Rail Additive combines cleaning and lubrication-enhancing properties to help maintain injector cleanliness and protect fuel-system components. Its corrosion protection also supports long-term fuel-system maintenance.

Benefits for Cold-Start Performance

Diesel ignition quality is influenced by the cetane number of the fuel. LIQUI MOLY Common Rail Additive increases the cetane number, helping improve ignition performance.

The manufacturer notes that treated fuel can show better combustion behaviour when the engine is cold. This makes the product particularly relevant for diesel vehicles that experience frequent cold starts or short journeys.

Why Choose LIQUI MOLY Common Rail Additive?

LIQUI MOLY Common Rail Additive is specifically formulated for the requirements of Common Rail and Pump-Injection diesel engines. Its combination of cleaners and lubrication improvers helps maintain high-precision injectors, protect against wear and corrosion, and improve fuel ignition quality.

The 250ml container treats up to 75 litres of diesel fuel, making it convenient for routine fuel-system maintenance. It is especially suitable for vehicles using low-sulfur diesel fuel.

Important Usage Information

• Designed for diesel fuel only.
• Do not add to petrol, engine oil, coolant or transmission fluid.
• Follow the recommended dosage of 250ml for up to 75 litres.
• For best results, follow the manufacturer’s guidance on continual use with low-sulfur diesel.
• Avoid combining with LIQUI MOLY Diesel Particulate Filter Protection, article number 5148.
• Keep the original container closed and follow the safety instructions printed on the packaging.
• Store safely away from children and ignition sources.

LIQUI MOLY Common Rail Additive 250ml helps clean and protect high-pressure diesel injection systems, improve fuel lubricity, increase cetane rating and support smoother engine operation.