Purpose and Specifications

Castrol MAGNATEC 5W-40 A3/B4 is a fully synthetic engine oil designed for both petrol and diesel engines. It uses intelligent molecule technology that clings to engine parts like a magnet, providing protection from the moment you start your engine—even before oil circulates fully through the system.

This oil meets ACEA A3/B4 and API SN/CF specifications, making it compatible with most modern vehicles from leading manufacturers. The 5W-40 viscosity grade means it flows easily in cold weather (winter starts at -30°C) while maintaining protective thickness at high operating temperatures (up to 100°C).

Key Benefits

• Reduces engine wear by 50% during warm-up and stop-start driving compared to standard oils
• Protects from the first second you turn the key—up to 75% of engine wear happens during warm-up, and this oil's molecules stay on engine parts even when oil drains down
• Better for city driving—if you stop and start your engine frequently (up to 18,000 times per year in heavy traffic), this oil significantly reduces wear at each start
• Cleaner engine—detergent additives prevent sludge buildup and reduce deposits, helping maintain fuel economy and lower emissions
• Extended protection—works across all driving conditions and temperatures without breaking down as quickly as conventional oils

When to Use / Replace?

Use this oil if: Your vehicle manufacturer recommends a 5W-40 grade oil, or your handbook specifies ACEA A3/B4 or API SN/CF. It's ideal for modern engines, especially those with frequent stop-start driving in urban areas.

Oil change intervals: Follow your vehicle manufacturer's recommended service schedule, typically every 10,000–15,000 km or every 6–12 months, whichever comes first. Synthetic oils like this one often allow longer intervals than conventional oils—check your owner's handbook.

Storage: Keep unopened bottles in a cool, dry place. Shelf life is typically 3–5 years from manufacture date when stored properly.

Frequently Asked Questions

Q: Can I use this oil in my diesel engine?
A: Yes. Castrol MAGNATEC 5W-40 A3/B4 is approved for both petrol and diesel engines that require a 5W-40 grade. Always check your vehicle handbook to confirm compatibility.

Q: How often should I check my oil level?
A: Check your oil level monthly or before long journeys. A 1-liter bottle is ideal for top-ups between services, not for a complete oil change.

Q: Is this oil suitable for older vehicles?
A: This oil meets ACEA A3/B4 and API SN/CF specifications, which are compatible with most vehicles from the last 15+ years. However, always verify your vehicle handbook or consult a mechanic if unsure about compatibility with older engines.