Description
Vehicle Compatibility
This product is a gear oil selected by specification. Use only where the manufacturer specifies SAE 80W-90 and API GL-4. Confirm the required viscosity and GL rating in your owner’s manual before topping up or servicing.
- For manual gearboxes requiring 80W-90 with API GL-4
- For compatible transaxles and driveline units specifying GL-4 gear oil
- Commonly used as a top-up where the correct GL rating and viscosity are required
Do not use if your vehicle specifies GL-5 or a dedicated OEM fluid, unless the manual confirms compatibility.
Specifications
| Brand | Castrol |
|---|---|
| Product | Castrol Transmax |
| Fluid Type | Gear Oil |
| Capacity | 0.5 L |
| SAE Viscosity Grade | 80W-90 |
| API Specification | GL-4 |
| SKU | 3428688 |
Features
- GL-4 gear oil formulated for compatible manual transmission and driveline applications
- SAE 80W-90 viscosity grade suited to vehicles specifying this multi-grade gear oil
- Helps support smooth operation when used to the correct GL rating and viscosity
- Convenient 500ml bottle for top-ups and workshop use
Why Buy From Us
- Local South African stock
- 12-month warranty (manufacturing defects)
- Spec-check support available if you share your make, model, and whether it’s gearbox or differential use
Trusted by thousands of South African drivers for quality and durability.
Installation & Maintenance Tips
- Confirm the correct GL rating and viscosity in your owner’s manual before use
- Always clean around the fill plug before opening to prevent contamination
- Fill to the manufacturer’s specified level (overfilling can cause leaks and foaming)
- If shifting feels notchy after a fluid change, re-check that GL-4 (not GL-5) was required
- Dispose of used oil responsibly at an approved recycling facility
Important: Product information, kit contents and compatibility are provided as a guide and may contain errors or omissions. Please verify that this part and any included components are correct for your vehicle before installation. For full details see our Website Disclaimer (Errors & Omissions).