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Omala S 4 GX

Advanced Synthetic Industrial Gear Oil

Shell Omala S4 GX is an advanced synthetic heavy duty industrial gear oil offering outstanding lubrication performance under severe operating conditions, including reduced friction, long service life and high resistance to micro-pitting for optimal gear protection.

Performance Benefits

Long oil life – Maintenance saving

Shell Omala S4 GX is formulated using an advanced additive system in combination with specially selected synthetic base fluids to provide outstanding resistance to breakdown over long duration and/or high temperature operation.

This performance is recognised by Flender AG where a formal approval for 20,000 hours (four years) at 80 °C usage as been granted.

Shell Omala S4 GX can operate successfully at bulk temperatures up to 120 °C.

Shell Omala S4 GX offers the potential to significantly extend service intervals compared to conventional industrial gear oils.

Excellent wear & corrosion protection

Shell Omala S4 GX is formulated to have excellent load carrying capacity and micro-pitting performance providing long component life even under shock loading conditions. These features provide benefits over mineral oil-based products in terms of gear and bearing component life.

Shell Omala S4 GX also has excellent corrosion protection, even in the presence of contamination by water and solids.

Maintaining system efficiency

Shell Omala S4 GX can help maintain or enhance the efficiency of industrial gear systems through improved low temperature performance and lower friction in comparison to mineral oil-based products. This provides better lubrication at low start-up temperatures.

Shell Omala S4 GX oils have excellent water separation properties, such that excess water can be drained easily from lubrication systems to help extend the life of the gears and ensure efficient lubrication of the contact areas.


Wind turbines and other inaccessible installations

Shell Omala S4 GX is particularly recommended for certain systems where extra long life is required, maintenance is infrequent or systems are inaccessible.

Enclosed industrial gear systems

Recommended for industrial reduction gear systems operating under severe operating conditions, such as high load, very low or elevated temperatures and wide temperature variations

Other applications

Shell Omala S4 GX oils are suitable for lubrication of bearings and other components in circulating and splash-lubricated systems  

For highly loaded worm drives the Shell Omala “W” series oils are recommended.

For automotive hypoid gears, the appropriate Shell Spirax Oil should be used.

Specifications and Approvals

  • Meets ISO 12925-1 Type CKD, except ISO 1000
  • Meets ANSI/AGMA 9005-E02 (EP), except ISO 1000
  • Meets US Steel 224, except ISO 1000
  • Fully approved by Flender AG
  • Meets David Brown S1.53.106, except ISO 1000
  • Meets DIN 51517-3 (CLP), except ISO 1000

Approved for wind turbine gearboxes by:

  • Gamesa
  • Dongfang Wind Turbines
  • Dalian Heavy Industries
  • Sinovel

Health and Safety

Guidance on Health and Safety is available on the appropriate Material Safety Data Sheet, which can be obtained from your Shell representative.

Protect the Environment

Take used oil to an authorised collection point. Do not discharge into drains, soil or water.


Check compatibility with other products before use. Advice on applications not covered in this leaflet may be obtained from your Shell representative.

Typical Physical Characteristics

Shell Omala S4 GX 68 150 220 320 460 680
ISO Viscosity Grade ISO 3448 68 150 220 320 460 680
Kinematic Viscosity
at 40°C   mm2/s
at 100°C mm2/s
ISO 3104  
Viscosity Index ISO 2909 158 163 160 159 170 169
Flash Point COC °C ISO 2592 228 238 250 252 264 256
Pour Point °C ISO 3016 -54 -45 -45 -42 -36 -33
Density at 15°C kg/m3 ISO 12185 861 877 881 883 879 881
FZG Load Carrying Test
Failure load stage
DIN 51354-2 &
ISO 14635-1


Timken OK Load lbs ASTM D 2782 85 >85 >85 >85 >85 >85

These characteristics are typical of current production.  Whilst future production will conform to Shell's specification, variations in these characteristics may occur.