Purpose and Specifications

Castrol GTX Ultraclean 10W-40 A3/B4 is a premium semi-synthetic engine oil in a convenient 4L container, designed to clean away old engine sludge and prevent new buildup for longer engine life. Its double-action formula delivers 50% superior sludge protection compared to industry standards, keeping your gasoline or diesel engine running cleaner and smoother.

This oil flows easily at cold starts down to -25°C (CCS viscosity 6800 mPa.s) and maintains stability up to 208°C flash point, with kinematic viscosity of 14.7 mm²/s at 100°C and a high viscosity index of 149 for reliable performance in varying temperatures. It meets key specs including ACEA A3/B4, API SN/CF, VW 501.01/505.00, MB 229.1, Fiat 9.55535-D2/G2, and Renault RN0700/0710, making it ideal for VW, Mercedes, Fiat, Seat, Skoda, Hyundai, and Kia vehicles.

• Advanced anti-wear additives reduce friction and extend engine life
• Superior high-temperature deposit protection fights heat-related issues
• Pour point -39°C ensures reliable cold-weather starts
• Shelf life: 5 years unopened in cool, dry storage

When to Use / Replace?

Use Castrol GTX Ultraclean 10W-40 A3/B4 in older engines prone to sludge from short trips, heat, or contaminants, or any vehicle specifying 10W-40 ACEA A3/B4 oil. Perfect for daily drivers in temperatures from -30°C to 150°C operating range.

Replace every 10,000-15,000 km or 12 months, whichever comes first, based on manufacturer guidelines and driving conditions. Monitor oil level monthly and check for sludge signs like rough idling.

FAQ

Q: Is this oil fully synthetic?
A: No, it is high-quality semi-synthetic with premium base oils for excellent cleaning and protection at a great value.

Q: What cars fit this oil?
A: Approved for VW, Mercedes (MB 229.1), Fiat, Renault, Seat, Skoda, Hyundai/Kia, and more requiring ACEA A3/B4 10W-40.

Q: How does it handle extreme weather?
A: Excels in cold below -25°C for easy starts and hot conditions up to 208°C without breaking down.