Purpose and Specifications

Castrol GTX 10W40 A3/B4 4L engine oil is your reliable choice for keeping gasoline and diesel engines running strong. This premium oil uses a powerful 3X-Clean formula that fights sludge from heat, dirt, and short trips, keeping your engine 35% cleaner than industry standards for smoother performance and longer life.

With 10W40 viscosity, it flows easily in cold starts down to -25°C and stays thick up to 150°C in hot conditions, protecting vital parts like pistons and valves. Approved for ACEA A3/B4, API SL/CF, MB 229.1, VW 501.01/505.00, and FIAT 9.55535-D2 specs, it's perfect for European cars from VW, Mercedes, and Fiat.

• Removes and prevents sludge buildup to extend engine life
• Resists breakdown in extreme heat and cold
• Reduces wear with anti-wear additives
• 4-liter pack for full oil changes

When to Use / Replace?

Use Castrol GTX 10W40 in modern cars needing A3/B4 oils, especially for daily drives, city traffic, or hot climates. Ideal replacement every 10,000-15,000 km or 12 months, or sooner if towing or in dusty areas. Shelf life is 4-5 years unopened in cool, dry storage.

Switch to this oil if your engine shows sludge signs like rough idling or oil thickening.

FAQ

Is this oil good for high-mileage engines? Yes, its sludge-fighting formula cleans existing deposits and protects engines over 100,000 km, helping avoid costly repairs.

Can I use it in winter? Absolutely, the 10W rating ensures easy cold starts below 0°C while holding up in summer heat over 40°C.

How often should I change it? Every 12,000 km or yearly for normal driving; check your owner's manual for exact intervals.