Purpose and Specifications

LIQUI MOLY Pro-Line Radiator Stop Leak K is a premium 250 ml sealant that permanently seals hairline cracks and small leaks in your radiator and cooling system. Safe for aluminum radiators, it works with all conventional coolants and antifreezes without harming the water pump or heater. One bottle treats up to 40 liters of coolant, keeping your engine cool during normal operating temperatures from -30°C to 120°C.

• Quick fix: Seals leaks from stone damage or porous joints in minutes after adding to cold system and driving 10 minutes.
• Preventive power: Use before leaks start; stays in system indefinitely for ongoing protection up to 100,000 km or 2 years.
• Shelf life: 4 years unopened, store frost-free.

When to Use / Replace?

Use when coolant levels drop from small leaks or as preventive maintenance every 2 years / 50,000 km. No need to replace - it remains effective permanently without clogging lines. Ideal for cars, trucks, and motorcycles with water-cooled engines showing low coolant warnings.

FAQ

Q: How fast does it work? A: Leaks seal within 10 minutes of driving after adding to cold coolant.

Q: Is it safe for my aluminum radiator? A: Yes, fully compatible and won't damage pumps or heaters.

Q: Can I leave it in forever? A: Absolutely, it provides lasting protection without removal.