Purpose and Specifications

CASTROL Transmax Manual Longlife 75W-85 is a full synthetic transmission fluid designed for manual transmissions in commercial vehicles including trucks, buses, and light commercial vehicles. This premium fluid meets API GL-4 specification and is approved by major manufacturers including Mercedes-Benz (MB 235.4) and Volvo (97307).

The 75W-85 viscosity grade means the oil flows smoothly in cold conditions (winter starts) while maintaining protective thickness at normal operating temperatures. The synthetic formulation provides superior performance compared to conventional oils, with better stability at high temperatures and improved cold-weather flow.

Key Benefits

• Extended drain intervals: Excellent thermal and oxidative stability keeps the transmission cleaner longer, reducing maintenance frequency
• Smoother gear shifts: Superior cold flow characteristics ensure easier shifting, especially in winter conditions
• Better component protection: High shear stability and strong wear protection reduce wear on gears and bearings under heavy loads
• Lower operating temperatures: Synthetic formulation helps reduce heat buildup, extending transmission and lubricant life

When to Use / Replace?

Use this fluid in manual transmissions where your vehicle manufacturer specifies API GL-4 lubricants. Check your vehicle's service manual for the correct drain interval—synthetic fluids typically allow extended service periods of 80,000 to 160,000 kilometers or 2 to 3 years, depending on driving conditions and manufacturer recommendations.

Replace the transmission fluid if: You notice difficulty shifting gears, grinding noises, or if your vehicle has reached the manufacturer's recommended service interval. Severe driving conditions (frequent towing, mountainous terrain, or extreme temperatures) may require more frequent changes.

Store in a cool, dry location. The 20-liter canister is designed for professional use and fleet maintenance.

Frequently Asked Questions

Q: Can I use this in my passenger car transmission?
A: This fluid is formulated for commercial vehicle transmissions (trucks and buses) which operate under higher loads and temperatures. Check your vehicle's manual first—passenger cars typically require different transmission fluids. Using the wrong fluid can damage your transmission.

Q: How do I know if my transmission needs this fluid?
A: Look for your vehicle's service manual or the transmission manufacturer's specification. This fluid is approved for Mercedes-Benz (MB 235.4) and Volvo (97307) commercial transmissions, as well as Eaton Europe transmissions. If your vehicle requires API GL-4 specification, this product is suitable.

Q: What's the difference between synthetic and conventional transmission fluid?
A: Synthetic fluid lasts longer, performs better in extreme temperatures, and keeps your transmission cleaner. You'll typically go longer between fluid changes and experience smoother shifting, especially in cold weather. The trade-off is higher upfront cost, but you save money on maintenance over time.