Castrol Transmax Universal LL 75W-90 Transmission Oil

Purpose and Specifications

Castrol Transmax Universal LL 75W-90 is a fully synthetic manual transmission and final drive lubricant designed for synchronised manual transmissions, differentials, and axles across commercial vehicles and construction equipment. This single product works in multiple applications, reducing the need for different oils and minimizing the risk of using the wrong fluid.

The oil meets demanding industry standards including API GL-4 and GL-5, along with approvals for major manufacturers such as ZF, Scania, Volvo, and MAN transmissions. It is formulated with Smooth Drive Technology to deliver smooth gear shifting and reliable protection under heavy loads.

Key Performance Benefits

• Cold Weather Performance: Flows easily at temperatures as low as -51°C, ensuring quick starts and smooth shifting in winter conditions while improving fuel efficiency
• High Temperature Stability: Maintains protective film at operating temperatures up to 202°C, preventing wear and extending component life
• Extended Drain Intervals: Superior stability allows longer periods between oil changes, reducing maintenance costs and downtime
• Wear Protection: Advanced additive package protects gears and synchronisers from damage, even in severe-duty applications
• Seal Compatibility: Fully compatible with conventional mineral oils and existing seals, making it suitable for retrofitting into older equipment

When to Use / Replace?

Replacement Intervals: Follow your vehicle manufacturer's recommendations, typically every 50,000 to 100,000 km or annually for vehicles in moderate use. Heavy-duty commercial vehicles and construction equipment may require more frequent changes depending on operating conditions.

Operating Temperature Range: This oil performs reliably between -40°C and +100°C, making it suitable for year-round use in most climates. In extreme cold regions below -40°C, monitor shift quality and consider pre-warming if necessary.

Shelf Life: Store in a cool, dry location away from direct sunlight. Properly sealed containers maintain quality for up to 5 years from the date of manufacture.

Frequently Asked Questions

Q: Can I mix Castrol Transmax Universal LL with other transmission oils?
A: Yes, it is fully compatible with conventional mineral transmission oils. However, for best results, drain the old oil completely before refilling with the new product to maximize performance benefits.

Q: Is this oil suitable for both manual transmissions and differentials?
A: Yes, this is a multipurpose fluid approved for use in both synchronised manual transmissions and final drives/differentials, eliminating the need to stock separate products.

Q: What makes this oil better in cold weather?
A: The 75W rating means it flows like a 75-weight oil in cold conditions (down to -40°C), allowing the transmission to shift smoothly and reducing engine strain during winter starts. At operating temperature, it thickens to provide the protection of a 90-weight oil.