Purpose and Specifications

LIQUI MOLY 5168 Pro-Line Intake System Cleaner Diesel is a powerful spray cleaner designed specifically for diesel engines. This 400ml aerosol can uses a special active solvent and high-tech additives to remove greasy deposits, oil, soot, and dirt from the intake system, throttle valve, EGR valve, and intake manifold without disassembly.

It restores smooth engine operation, boosts power, quiets noise, and cuts fuel consumption by keeping moving parts free and functional. Safe for diesel particulate filters (DPF), it works at engine speeds around 2,000 RPM during application for quick, effective cleaning.

• Volume: 400ml aerosol can
• Application time: 5-10 minutes per can
• Engine suitability: All diesel engines
• Shelf life: 4 years unopened
• Repeat interval: Every 20,000 km or annually for maintenance

When to Use / Replace?

Use this cleaner when you notice rough idling, power loss, increased fuel use, black exhaust smoke, or poor acceleration in your diesel engine. It's ideal for preventive maintenance every 20,000 km or 12 months to prevent costly repairs like walnut blasting. Spray into the intake at 2,000 RPM in short bursts; run engine afterward to burn off residue. One or two cans handle most jobs, with repeat cleaning possible if heavy deposits remain.

Store in a cool, dry place below 50°C; do not puncture or incinerate even when empty. For best results, apply with engine warm.

Frequently Asked Questions

Can I use this on my gasoline engine? No, this product is formulated only for diesel engines. Use LIQUI MOLY's gasoline version for petrol motors.

How often should I clean the intake system? For preventive care, every 20,000 km or once a year. More frequently if you experience performance issues or high mileage driving.

Is it safe for DPF and modern emissions systems? Yes, it's fully compatible with diesel particulate filters and won't harm sensors when applied correctly, avoiding direct contact.