Famhipo 90 is a single-grade gear oil formulated for the lubrication of transmissions, differentials, and planetary gear systems in passenger cars and trucks. This GL-4 quality level oil is specifically recommended for hypoid gear synchronous transmissions, where its moderate extreme-pressure additive concentration provides effective gear protection without being aggressive toward synchronizer materials.

The GL-4 performance level is specifically designed for synchronized manual transmissions and moderate-duty differentials. Unlike GL-5 oils, which contain higher concentrations of extreme-pressure additives that can attack bronze and brass synchronizer rings, GL-4 oils use a balanced additive chemistry that provides effective gear protection while preserving synchronizer integrity. This makes Famhipo 90 the correct choice for manual transmissions where the manufacturer specifically requires GL-4 lubricant.

The SAE 90 monograde viscosity provides a robust oil film suited for operation in stable temperature conditions. It offers effective protection for heavily loaded gear teeth and bearings at operating temperature, handling both constant and shock loads typical of automotive drivetrain applications.

Key performance benefits include reliable extreme-pressure protection for hypoid and spiral bevel gear sets, good thermal and oxidative stability for consistent performance across the service interval, effective corrosion protection for internal metal surfaces, and foam resistance for consistent lubrication. Famhipo 90 is a proven, economical choice for manual transmissions and differentials in passenger cars, delivery vehicles, and trucks where GL-4 monograde gear oil is specified. It provides dependable drivetrain protection for daily driving, regional delivery, and long-haul trucking applications.