GL-4 Gear Oil is a premium mineral-based gear lubricant engineered with a balanced blend of Extreme Pressure (EP) additives, anti-wear agents, and corrosion inhibitors. Formulated to meet the API GL-4 performance standard, this lubricant is specifically designed for manual transmissions, synchronized gearboxes, and light-to-medium-duty differentials. Its optimized EP chemistry provides adequate gear protection while maintaining full compatibility with yellow metal components, such as brass and bronze synchronizers, which are commonly used in manual transmission systems.

GL-4 Gear Oil ensures smooth gear engagement, effective wear control, and reliable film strength under moderate to heavy loads. With enhanced oxidation stability, high thermal resistance, and excellent anti-foam performance, it delivers extended lubricant life and consistent gearbox efficiency across a wide range of operating conditions.

Key Product Features

1. Balanced EP Protection

GL-4 Gear Oil includes carefully optimized sulfur–phosphorus EP additives that protect gears from scuffing, pitting, and micro-welding without damaging yellow metal components.

2. Yellow Metal Compatibility

Unlike GL-5 lubricants, which contain aggressive EP packages, GL-4 is formulated to be safe for brass and bronze components, preventing premature wear or corrosion of synchronizers.

3. Smooth Shifting Performance

Its controlled friction characteristics help maintain synchro function, enabling smoother gear changes and reducing gearbox noise and vibration.

4. Thermal & Oxidation Stability

The formulation resists sludge formation, thickening, and thermal breakdown, even in extended drain intervals or high-temperature operating conditions.

5. Anti-Foam & Anti-Corrosion Protection

Minimizes foam formation and ensures fast air release, preventing lubrication interruptions. It also provides robust resistance against rust, corrosion, and moisture contamination.

Applications of GL-4 Gear Oil

GL-4 Gear Oil is recommended for:

1. Manual Transmissions

Ideal for passenger cars, light commercial vehicles, and trucks that require GL-4 level performance. It protects synchronizers and reduces wear in helical, spur, and bevel gears.

2. Light-to-Medium Duty Differentials

Suitable for differential assemblies that do not require the higher EP protection level of GL-5.

3. Industrial Gearboxes

Recommended for enclosed industrial gear systems such as:

• Speed reducers
• Conveyor drive gearboxes
• Gear motors
• Agricultural machinery gear units

4. Off-Highway & Agricultural Equipment

Provides stable lubrication for tractors, loaders, and utility vehicles, especially those using synchronized gear systems.

Performance Advantages

• Enhanced wear protection under moderate-to-heavy loads
• Improved shifting feel and reduced transmission noise
• Long fluid life due to strong oxidation resistance
• Excellent protection against rust and corrosion
• Compatible with seals and elastomers used in modern gear systems
• Reliable lubrication across a wide temperature range
• Prevents deposit formation and varnish buildup

Typical Technical Specifications (TDS – Example Values for 80W-90)

Note: Exact values may vary depending on viscosity grade (75W-90, 80W-90, 85W-90).

Storage & Handling Recommendations

• Store in sealed containers away from moisture and contaminants
• Keep away from direct sunlight or high temperatures
• Use clean dispensing equipment to prevent cross-contamination
• Follow proper waste disposal guidelines for used gear oil

Why Choose GL-4 Gear Oil?

GL-4 Gear Oil is the optimal choice for systems requiring balanced EP protection and synchronizer compatibility. It supports:

• Longer gearbox life
• Lower maintenance costs
• Improved gear shift quality
• Protection of bronze components
• Excellent performance in harsh operating conditions

Conclusion

GL-4 Gear Oil offers a perfect balance of EP protection, thermal stability, and synchronizer compatibility, making it the leading choice for manual transmissions and light-duty differentials. Its carefully engineered formulation ensures long-lasting performance, reliable lubrication, and minimal wear even under demanding operating environments.