Extra High Performance Power Transmission Fluid

Mobilfluid 125 is an extra high performance power transmission fluid that is formulated for use in hydrodynamic gears and hydraulic systems typically found in railroad, marine, construction, and industrial applications. It is formulated using high performance basestocks and advanced additives to deliver the precise performance required to transfer power responsively. Mobilfluid 125 is engineered to withstand the stresses of heavy-duty, low and high speed applications in a wide range of severe operating environments.

Features and Benefits

The use of hydrodynamic gear systems and hydraulic control systems depends on high performance fluids to achieve consistent and responsive control and efficiency of the equipment. These systems operate under high pressures and temperatures that can cause deposits in control valves where precise control of torque converters and hydraulics takes place. The key benefits of Mobilfluid 125 include:

Features Advantages and Potential Benefits
Good wear protection Extended component life, increased productivity, and lower maintenance costs
Effective resistance to thermal degradation and oxidation Significant reduction in harmful lacquers, deposits, and sludge
Maintains power transfer and good control response
Extends oil service life
Good low temperature properties Easy start-up and responsive hydraulic control
Effective rust and corrosion protection including long stoppages in wet or humid ambient conditions Reduces wear with reliable equipment start-up and lower maintenance costs
Excellent air release properties eliminate foaming problems Delivers optimal hydraulic response and power transfer
Maintains fluid film for improved lubrication
Compatible with seals and gasket materials used in these systems Reduced fluid leakage, pressure losses, and contamination


Recommended by ExxonMobil for use in:

  • Fluid couplings and drives, torque converters, and hydraulic control systems used in railroad, marine, construction, and industrial applications

Specifications and Approvals

Mobilfluid 125 is recommended by ExxonMobil for use in applications requiring:
UTTO Voith Turbo Transmissions 3.285-149

Typical Properties

Mobilfluid 125
ISO Viscosity Grade 32
Viscosity, ASTM D 445
cSt @ 40ºC 30
cSt @ 100ºC 5.3
Viscosity Index, ASTM D 2270 104
Pour Point, ºC, ASTM D 97 -30
Flash Point, ºC, ASTM D 92 225
Density @ 15ºC kg/l, ASTM D 4052 0.878

Health and Safety

Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS’s are available upon request through your sales contract office, or via the Internet. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.


It cannot be guaranteed that the product information given above is up to date. For the latest version of the Product Data Sheet we refer to the product library of ExxonMobil.