Industrial Lubricants

Open Gear Grease

AMSOIL Open Gear Grease is engineered specifically for use in wind turbine pitch and yaw gears. Its unique combination of base oils, calcium-sulphonate-complex thickeners and carefully chosen additives solve common gear-tooth issues such as fretting, pitting, corrosion and the general lack of grease between heavily loaded gear sets. Open Gear Grease is a tacky grease that stays in place with exceptional tenacity due to a proprietary combination of additives. It protects against fretting from extreme cyclical loads and vibration while offering protection when the nacelle ratchets during backlash events and places heavy impact-type loads between gear teeth. Open Gear Grease’s highly tenacious formula creates thin filaments of grease that distribute across the gear face after meshing, increasing lubrication during the next pass. Open Gear Grease contains a combination of solid additives to provide additional protection and improved film thickness, which is critical in wind turbines to ensure separation of heavily loaded gears and to avoid damage.

Typical Tecnical Properties

NLGI Grade 2
Thickener Type Calcium Sulphonate Complex
Color, Visual Dark Gray
Penetration, Worked, 25°C, mm (ASTM D217) 280
Dropping Point, °C, cSt (ASTM D2265) 600
Viscosity of Base Oil @ 40°C, cSt (ASTM D 445) 232
4-Ball EP Test, Weld Load, kgf (ASTM D2596) 800
4-Ball Wear @ 60C, Scar Diameter, mm (ASTM D2266) 0.51
Water Washout @ 60C, %wt, (ASTM D1264) 0.7
Corrosion Protection, Rating (ASTM B117) >1000
Timken Load, lbs. (ASTM D2509) 60+


For recommendations on safe handling and use of these products, please refer to the Safety Data Sheet (SDS). Contact the AMSOIL Wind Group for more information.

WARNING: This product can expose you to Methanol, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to