80W-90 Gear Oil (High Performance GL-4)
Greyhound 80W-90 GL-4 Gear Oil is a high-performance extreme pressure (EP) lubricant formulated from premium mineral base oils and advanced additive technology. It provides excellent thermal stability, oxidation resistance, and protection against wear, helping to extend both lubricant and component life under normal operating conditions.
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. It is suitable for passenger vehicles, light commercial fleets, and equipment where GL-4 performance is specified.
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 heavy 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 and protects 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, and construction vehicles.
Greyhound™ G-Moto Gear Oil SAE 80W-90 GL-4 is a high-performance, extreme pressure (EP) gear oil formulated for the lubrication of mechanical transmissions, including synchromesh gearboxes requiring compatibility with yellow metals such as brass and bronze components.
It provides excellent wear protection, thermal stability, and resistance to oxidation under demanding operating conditions. The formulation ensures smooth gear shifting and protects synchronisers, making it suitable for passenger vehicles, commercial fleets, agricultural machinery, and industrial equipment where API GL-4 performance is specified.
Specifications: API GL-4, SAE 80W-90, MB 235.1, MAN 341 Type E-1 / Z-1, ZF TE-ML 16A, 17A, 19A, Ford SQM-2C-9008 A.
Benefits:
- Suitable for synchromesh manual transmissions requiring GL-4 performance
- Protects yellow metal components (brass/bronze synchronisers)
- Good EP and anti-wear protection under load
- Smooth gear shifting and synchroniser protection
- Excellent oxidation stability at elevated temperatures
- Anti-rust and anti-foam protection for consistent lubrication
- Compatible with common seals and transmission materials