Purpose and Specifications

LIQUI MOLY Pro-Line Engine Flush is a professional-grade engine cleaning additive designed to remove harmful deposits and sludge from gasoline and diesel engines before an oil change. This 500ml bottle treats engines with 3–5 liters of oil capacity.

What it does:

• Dissolves sludge, lacquer, and carbon deposits that accumulate inside the engine
• Restores proper oil flow and pressure in hydraulic systems like variable valve timing (VVT)
• Improves cold-start performance by ensuring oil reaches critical engine parts quickly
• Prevents corrosion on unprotected metal surfaces
• Works safely with diesel particulate filters, catalytic converters, and turbochargers

Compatible with: All commercial gasoline and diesel engine oils. Not suitable for motorcycles.

When to Use / Replace?

Use this product:

• Before every major oil change, especially if your engine has high mileage (over 100,000 km) or shows signs of sluggish cold starts
• When you notice reduced fuel economy or rough idling
• As preventive maintenance every 20,000–30,000 km if your vehicle operates in dusty conditions or with extended oil change intervals

Application process: Add the entire 500ml can to your engine oil while the engine is warm. Let the engine idle for 10–15 minutes (depending on contamination level), then perform a complete oil and filter change. The product works at normal operating temperatures (80–100°C).

Shelf life: Store in a cool, dry place. Typical shelf life is 3–5 years when unopened.

Frequently Asked Questions

Q: How often should I use engine flush?
A: For regular maintenance, use it once per year or every 20,000–30,000 km before an oil change. High-mileage engines or those with visible sludge may benefit from more frequent use.

Q: Will this damage my engine seals or gaskets?
A: No. LIQUI MOLY Pro-Line Engine Flush is formulated to be gentle on all common sealing materials and does not attack rubber or plastic components.

Q: Can I use this in a diesel engine with a particulate filter?
A: Yes. This product is specifically tested and approved for use with diesel particulate filters (DPF) and catalytic converters, making it safe for modern emission-controlled engines.