Purpose and Specifications

EUROL Fultrasyn 75W-90 GL4/5 is a fully synthetic transmission oil designed for manual gearboxes and final drives (differentials) in cars and light trucks. This universal oil meets API GL-4 and GL-5 specifications, making it compatible with most manual transmissions and rear differentials manufactured in the last 20+ years.

Key Performance Benefits:

• Smooth shifting at temperatures as low as -54°C, even in winter conditions
• Protects against wear, corrosion, and foam buildup inside your gearbox
• Handles extreme pressure loads from towing, heavy acceleration, and rough terrain
• Maintains proper thickness under high heat (up to 230°C flash point), preventing metal-to-metal contact
• Reduces fuel consumption through optimized friction control

Oil Specifications: Viscosity 75W-90 means it flows like a 75-weight oil in winter and a 90-weight oil at operating temperature. Density: 0.87 kg/L. Fully synthetic base provides superior stability compared to mineral oils.

When to Use / Replace?

Replace your transmission oil every 40,000 to 80,000 km (25,000 to 50,000 miles) depending on driving conditions. Check your vehicle's owner manual for the exact interval—some modern cars can go longer with synthetic oil.

Use this oil if:

• Your manual transmission or differential calls for API GL-4 or GL-5 rated oil
• You experience rough shifting, especially in cold weather
• You tow trailers or carry heavy loads regularly
• You want extended drain intervals and better protection than mineral oil

Storage: Keep unopened containers in a cool, dry place. Shelf life is typically 2-3 years when stored properly. Once opened, use within 6 months for best results.

Frequently Asked Questions

Q: Can I use this in my front-wheel-drive car's transmission?
A: Yes. This oil works in manual transmissions, differentials, and transfer cases. Always verify your owner's manual specifies GL-4 or GL-5 before use.

Q: Is synthetic oil worth the extra cost?
A: Yes. Synthetic oil lasts 2-3 times longer than mineral oil, handles temperature extremes better, and reduces wear. For a 1-liter bottle, the cost difference is minimal compared to the protection gained.

Q: Will this oil fix my grinding gears?
A: Fresh oil can improve shifting smoothness, but grinding usually indicates worn synchronizers or bearings requiring mechanical repair. Use this oil as preventive maintenance, not a cure.