75W-90 Gear Oil (Full Synthetic GL-4)
Greyhound 75W-90 GL-4 Gear Oil is a high-performance full synthetic extreme pressure (EP) lubricant formulated with advanced additive technology. It delivers excellent thermal stability, oxidation resistance, and protection against wear, ensuring extended lubricant and component life under demanding operating conditions.
The synthetic formulation provides consistent performance across a wide temperature range, supporting smooth gear engagement and reliable operation in both high and low temperature environments. The oil forms a durable protective film and is specifically formulated for manual transmissions, transaxles, and synchronised gearboxes where controlled friction and yellow metal compatibility are required.
API Performance Levels:
- GL-4 – Moderate EP additive level designed for manual gearboxes and synchronised transmissions requiring compatibility with yellow metals (such as brass/bronze components).
- GL-5 – Higher EP additive level for hypoid gears, axles, and differentials operating under severe load and shock conditions.
Understanding GL-4 vs GL-5:
GL-4 oils are formulated with a balanced level of extreme pressure additives to protect gears while maintaining the correct friction characteristics required for synchronisers. This ensures smooth gear engagement, efficient shifting performance, and protection of sensitive yellow metal components commonly found in manual transmissions. GL-5 oils contain a higher level of EP additives designed for heavily loaded differential gears. While they provide superior load-carrying capability, these additives may reduce synchroniser performance in manual gearboxes. For this reason, GL-4 should always be used where specified for transmission applications, while GL-5 is reserved for differential and final drive systems.
Use GL-4 where specified for gearbox applications requiring synchroniser protection and controlled friction performance. For differential applications requiring maximum extreme-pressure performance, a GL-5 or GL-5 LS oil should be selected.
Application: Manual transmissions, gearboxes, and transfer boxes in passenger, commercial, agricultural, and construction vehicles.
Greyhound™ G-Moto Gear Oil SAE 75W-90 GL-4 is a high-performance, fully synthetic, extreme pressure (EP) gear oil formulated from carefully selected base oils and advanced additive technology. It is designed for synchromesh gearboxes requiring API GL-4 performance and compatibility with yellow metals such as brass and bronze components.
The synthetic formulation provides excellent low-temperature fluidity, thermal stability, and oxidation resistance, ensuring smooth gear engagement and reliable protection under demanding operating conditions. It is suitable for passenger vehicles, commercial fleets, and industrial equipment where controlled friction and synchroniser protection are essential.
Greyhound Lubricants G-Moto Gear Oil SAE 75W-90 GL-4 is recommended for manual transmissions where the higher additive levels of GL5 oils may interfere with gear engagement and synchroniser performance. Not suitable for heavily loaded hypoid differentials requiring API GL-5.
Specifications: API GL-4, SAE 75W-90, ZF TE-ML 16A, 17A.
Benefits:
- Full synthetic formulation for improved performance across the temperature range
- Suitable for synchromesh manual transmissions requiring GL-4
- Protects yellow metal components (brass/bronze synchronisers)
- Smooth gear shifting and improved synchroniser performance
- Excellent wear protection for gears and bearings
- Strong oxidation stability at elevated temperatures
- Anti-rust and anti-foam protection for reliable lubrication
- Compatible with common seals and transmission materials