AeroShell Fluid S.8350 is an SAE 90 mineral-based extreme pressure gearbox oil formulated for helicopter rotor gears and drive systems operating under high load and low speed.
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Shell AeroShell Fluid S.8350

AeroShell Fluid S.8350 is an SAE 90 mineral-based extreme pressure gearbox oil formulated for helicopter rotor gears and drive systems operating under high load and low speed.

Category:

Shell AeroShell Fluid S.8350

SAE 90 mineral gear oil for helicopter transmissions

  • Extreme pressure lubricant formulated for helicopter rotor gears, drive-shafts, and pitch control systems

  • Designed for high-load, low-speed gear applications

  • Approved for use in various Westland helicopter gearboxes

  • Mineral base oil with EP additive system for gear wear protection

  • Not suitable for engine lubrication

  • Excellent foam control and copper corrosion resistance

  • Complies with Joint Service Designation OEP-215

Global Product Code: 001A0911



Application:

AeroShell Fluid S.8350 is a mineral-based SAE 90 extreme pressure (EP) gearbox oil formulated for use in helicopter rotor gears, drive-shafts, and pitch control mechanisms. It is specifically designed for applications requiring a high-viscosity lubricant to withstand slow speeds and heavy loads. AeroShell Fluid S.8350 is approved for use in several Westland helicopter gearboxes and must not be used in engines.

Performance Features & Benefits:

  • Extreme Pressure Protection: EP additives protect heavily loaded gear systems.
  • Foam Control: Passes all foaming tendency tests across operational sequences.
  • High Viscosity Stability: Maintains gear protection under demanding load and thermal conditions.
  • Temperature Performance: Effective down to –31°C with a high flash point of 217°C.

Main Application Areas:

  • Helicopter rotor gearboxes
  • Drive-shafts
  • Pitch control mechanisms
  • High-load, low-speed aviation gear systems

Specifications & Approvals:

  • Joint Service Designation: OEP-215

Environmental & Safety Information:

  • This product is unlikely to present any significant health or safety hazard when used as recommended with good hygiene practices.
  • Use impervious gloves with used oil and avoid skin contact.
  • Wash immediately with soap and water after exposure.
  • Do not discharge into drains, soil, or water systems. Dispose via authorised waste oil collection points.
  • Safety Data Sheet (SDS) available via inquiry

Technical Specifications:

Property Typical Value Method
Oil Type Mineral —
Density @15°C 880 kg/m³ ISO 12185
Kinematic Viscosity @40°C 169 mm²/s ASTM D445
Kinematic Viscosity @100°C 17.20 mm²/s ASTM D445
Viscosity Index 109 ASTM D2270
Pour Point –31°C ASTM D97
Flash Point 217°C ASTM D92
Foaming Tendency Sequence I Passes (≤300 ml) ASTM D892
Foaming Tendency Sequence II Passes (≤50 ml) ASTM D892
Foaming Tendency Sequence III Passes (≤300 ml) ASTM D892
Copper Corrosion (1 h @121°C) 1B ASTM D130
Phosphorus Content 0.072% m ASTM D4951

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