What Are Hypoid Gear Oils?
Hypoid gears use an offset design that allows power to be transferred between shafts that don't intersect. This arrangement is commonly used in vehicle differentials but creates both sliding and rolling contact between the gear teeth. Hypoid gear oils are formulated to maintain a protective lubricating film under these demanding conditions.
Why Hypoid Gears Need the Correct Lubrication
The pressure and sliding action within a hypoid gear set can place significant stress on both the lubricant and gear surfaces. Suitable oils typically contain additives designed to provide protection under high loads, helping to minimise wear, scoring and damage to the gear teeth.
Choosing the Correct Hypoid Gear Oil
The correct lubricant will depend on the manufacturer's recommended viscosity grade and performance specification. Different vehicles and equipment can require different formulations, so viscosity shouldn't be the only consideration. Always check the handbook or technical information for the specific differential or final drive being serviced.
Understanding GL-4 and GL-5 Gear Oils
API GL classifications indicate the performance requirements a gear oil is designed to meet. GL-5 oils are commonly specified for hypoid gears operating under high loads, while GL-4 lubricants are used in other gear and transmission applications. A higher GL number doesn't automatically mean the oil is suitable as a replacement, so the manufacturer's specified classification should always be followed.
Hypoid Gear Oils for Different Applications
Hypoid gears are used across passenger cars, commercial vehicles, 4x4s, agricultural machinery and off-highway equipment. Operating loads, temperatures and gear designs can vary significantly between these applications, making it important to match the lubricant to the individual vehicle or machine.
Related Gear Oils and Lubricants
Different parts of a drivetrain can require different lubricants. Automotive Gear Oils cover a wider range of gearbox and drivetrain applications, while Off Highway Transmission Oils are designed for suitable agricultural, construction and heavy equipment. Industrial Gear Oils are available for industrial gear systems, and PAG Gear Oils cover specialist applications where PAG-based formulations are required.
Other parts of the vehicle or machinery may also require Greases for bearings, joints and other suitable lubrication points.
Finding the Right Hypoid Gear Oil
Before selecting a hypoid gear oil, check the vehicle or equipment manufacturer's recommendations for viscosity grade, API GL classification and any additional specifications or approvals. If you're unsure which product is suitable, you can contact our team with details of the vehicle, machinery or gear system.
