Mobil Synthetic Gear Oil 75W-90

Fully Synthetic Railway Gearbox Lubricant

Mobil Synthetic Gear Oil 75W-90 is a fully synthetic gear lubricant formulated from synthetic base oils and an advanced additive system.  It is designed for use in many railway gearboxes and provides excellent load-carrying capability where extreme pressures and shock loading are expected.  This gear oil  provides excellent thermal and oxidation stability, high Viscosity Index (VI), extremely low pour point, and low-temperature fluidity.  Mobil Synthetic Gear Oil 75W-90  meets the API GL-5 performance level.


Features and Benefits

Railway gearbox designs have changed and increased the requirements of fluids to deliver higher performance including potentially increased productivity and reduced operating costs.   Mobil Synthetic Gear Oil 75W-90  is engineered to deliver exceptional performance and contribute to lower  total lubrication-related operating costs. The key potential benefits include:



Advantages and Potential Benefits

Exceptional thermal stability and resistance to high temperature oxidation

Extended gear and bearing life due to minimal deposits

Longer seal life

Outstanding protection against low speed/high torque wear and high speed scoring

Increased load-carrying capability.

Contribution to reduced maintenance costs and longer equipment life

Enhanced frictional properties

Helps to reduce operating costs

Outstanding low temperature fluidity versus mineral oils

Contribution to reduced wear and ease of start up

Good resistance to foaming

Maintains film strength for reliable lubrication



Recommended by ExxonMobil for use in

     •  Gearboxes requiring API GL-5 performance

     •  Not recommended for applications requiring API GL-4 Level performance

     •  Not intended for automatic, manual, or semiautomatic transmissions for which engine oil or automatic transmission fluids are recommended.


Please verify OEM requirements and oil selection criteria for your specific railway gearbox and application.


Specifications and Approvals

This product has the following approvals:

Voith Turbo 132.00374401

Voith Turbo 132.00374402

Siemens Traction Gears GmbH (former Flender Rail) T7302


This product meets or exceeds the requirements of:



Properties and Specifications




SAE 75W-90

Density @ 15 C, g/cm3, ASTM D4052


Flash Point, Cleveland Open Cup, °C, ASTM D92


Kinematic Viscosity @ 100 C, %, ASTM D445


Kinematic Viscosity @ 40 C, mm2/s, ASTM D445


Pour Point, °C, ASTM D97


Viscosity Index, ASTM D2270



Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @