Purpose and Specifications

Castrol Transmax ATF Dex III Multivehicle is a premium automatic transmission fluid designed for smooth, reliable gear shifting in a wide range of vehicles. This 1-liter bottle meets General Motors Dexron III and Ford Mercon performance standards, making it suitable for most passenger cars, light commercial vehicles, and SUVs with automatic transmissions built before 2005.

The fluid works by maintaining consistent viscosity—thickness—across temperature ranges from cold winter starts to hot highway driving. It protects internal transmission components like clutch packs and bands from wear while reducing the buildup of harmful deposits that can cause rough shifting or transmission damage.

• Enhanced friction durability: Delivers smooth, responsive gear changes and extends transmission life
• Superior wear protection: Shields clutch bands, clutch packs, and metal components from premature wear
• Thermal stability: Resists breakdown and deposit formation in high-temperature conditions
• Cold-weather performance: Flows easily at low temperatures for reliable cold-start shifting
• Copper and bronze protection: Prevents corrosion of transmission internal parts

When to Use / Replace?

Check your vehicle's owner manual for the recommended service interval. Most automatic transmissions require a fluid change every 60,000 to 100,000 kilometers (37,000 to 62,000 miles) or every 4 to 6 years, whichever comes first. Some modern transmissions are sealed and may not require regular changes—always verify with your manufacturer's specifications.

Use this fluid if your vehicle requires Dexron III or Mercon performance standards. Do not use this product in vehicles requiring Dexron VI, Mercon V, Mercon SP, or specialist fluids like those for Mercedes-Benz, BMW, or ZF transmissions. Always consult your vehicle's handbook before purchasing.

Operating temperature range: This fluid maintains protection between approximately -40°C and 100°C, covering extreme winter conditions and sustained highway driving.

Frequently Asked Questions

Q: Can I mix this fluid with other transmission fluids?
A: No. Always drain the old fluid completely before adding a new type. Mixing different transmission fluids can reduce protection and cause shifting problems. If you're unsure what fluid is currently in your transmission, have a professional drain and refill it.

Q: How do I know if my transmission needs new fluid?
A: Check the fluid level and color using the dipstick (if your vehicle has one). Healthy fluid is bright red; dark brown or black fluid indicates it needs replacement. Rough or delayed shifting, slipping gears, or a burning smell also signal that a fluid change is overdue.

Q: Is this fluid suitable for power steering systems?
A: Yes, this product can be used in power steering applications where Mercon performance is specified. However, always confirm your vehicle's requirements in the owner manual before using it for power steering.