Purpose and Specifications

LIQUI MOLY 21149 Radiator Antifreeze KFS 11 is a premium ethylene glycol-based coolant that delivers top-tier protection against frost, corrosion, and overheating for your vehicle's cooling system. This 1-liter concentrate uses hybrid inhibitor technology to safeguard cast iron, aluminum, and mixed-material engines, plus systems with aluminum and copper alloys. Mix it right with water for year-round reliability in cars, trucks, motorcycles, farm equipment, and more.

Key practical benefits:

• Protects down to -40°C at 50/50 mix or -68°C at stronger ratios, keeping your engine safe in extreme cold.
• Boils at 174°C to prevent summer overheating and warped heads.
• Free of harmful amines, nitrites, and phosphates for cleaner, longer-lasting performance.
• Shelf life of 5 years unopened; store between -20°C to +35°C.
• Approved for major brands like VW/Audi (TL-774 C G11), BMW, Mercedes, Fiat, MAN, and Volvo.

When to Use / Replace?

Use LIQUI MOLY 21149 when flushing your cooling system during routine maintenance or if you spot rusty coolant, leaks, or overheating. Replace every 2-4 years or 40,000-60,000 km per most manufacturer guidelines to avoid clogs and engine damage. Always clean with LIQUI MOLY Radiator Cleaner first, rinse, then mix: 1 part antifreeze to 1 part water for -40°C protection.

Pro tip: A fresh mix keeps pumps, radiators, and hoses running smooth, saving you big on repairs.

FAQ

Q: What's the best mix for most climates?
A: Go 50/50 (1 part antifreeze to 1 part water) for balanced frost protection to -40°C and overheating defense.

Q: Safe for my aluminum engine?
A: Yes, hybrid inhibitors excel at protecting aluminum without corrosion, perfect for modern high-performance motors.

Q: How often change it?
A: Follow your owner's manual, typically every 2-4 years or 40,000-60,000 km to maintain peak cooling.