Purpose and Specifications

Castrol Magnatec 5W-40 A3/B4 4L engine oil delivers instant protection from the moment you turn the key. Its intelligent molecules cling like a magnet to critical engine parts when the oil drains down, forming an extra layer that slashes up to 75% of engine wear during warm-up and stop-start driving.

This fully synthetic oil flows easily in cold starts down to -30°C for quick protection, while staying strong up to 150°C to handle high heat and heavy loads. Perfect for petrol and diesel engines needing ACEA A3/B4 specs, it suits modern cars with emission systems like DPF for longer life and better fuel economy.

• Clings to metal surfaces for non-stop startup protection
• Reduces wear by 50% in tough stop-start traffic
• Manages deposits to protect pistons, valves, and bearings
• 4-liter pack for most passenger cars

When to Use / Replace?

Use Castrol Magnatec 5W-40 A3/B4 in cars with frequent short trips, city stop-start driving, or extreme temps from -30°C to 150°C. Ideal for European, Japanese, and Korean vehicles like VW, BMW, Toyota, or Hyundai per your handbook.

Replace every 10,000-15,000 km or 12 months, whichever comes first, to keep protection strong. Shelf life is 5 years unopened in cool, dry storage.

FAQ

Can I use this in my diesel with DPF? Yes, its low-ash formula protects emission filters for better performance and fuel savings.

Does it work in cold winters? Absolutely, the 5W rating ensures smooth starts in freezing -30°C weather without thickening.

How much wear does it really cut? Lab tests show up to 75% less wear at startup and 50% overall versus standard oils.