Wind turbine at sea

Mobil SHC Gear 320 WT

Advanced Wind Turbine Gear Lubricant

Our Mobil SHC™ Gear 320 WT advanced wind turbine gear lubricant is a fully synthetic gear lubricant designed to protect wind turbine gearboxes operating under extreme conditions, such as extremely low or high temperatures and corrosive environments.

Mobil SHC Gear 320 WT wind turbine lubricant is formulated to provide excellent protection against conventional wear modes, such as scuffing, while also providing a high level of resistance against micropitting fatigue. This synthetic wind turbine gearbox oil comes with a 10-year warranty.

Mobil SHC Gear 320 WT wind turbine lubrication can: 

  • Maximize equipment productivity by minimizing unscheduled downtime and maintenance
  • Extend gear and bearing life under high-stress operating conditions
  • Extend oil life

Mobil SHC™ Gear 320 WT has received a second ‘design evaluation’ certification by DNV-GL, one of the world’s leading certification bodies for renewable energy projects. The certification is in recognition of the lubricant’s in-service performance, demonstrating that it does not contribute to the oil-related effects of white etching cracks (WEC). With 60 per cent of wind turbine gearbox failures attributed to WEC, it is a serious issue for wind turbine operators that can result in costly maintenance and lost productivity.

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Data sheets

Product information

  • Enhanced wear protection
  • Extended life
  • Low foam
  • Micropitting
  • Severe operating conditions
  • Wide temperatures

Technical resources

Features and Benefits

Mobil SHC synthetic lubricants are recognized and appreciated around the world for innovation and outstanding performance. Mobil SHC Gear 320 WT advanced wind turbine gear lubricant was developed in close relation with key wind turbine, gearbox, and bearing OEMs to ensure exceptional performance in the rapidly evolving wind turbine gearbox designs.


Our scientists designed a proprietary combination of additives that resist traditional gear wear mechanisms, such as scuffing, as well as protect against micropitting with very low tendency for sludge and deposit formation. The exclusive use of next-generation PAO synthetic base oils and utilization of a novel blending approach delivers balanced performance benefits in micropitting, viscosity index, air release, and low temperature flow characteristics.


Mobil SHC Gear 320 WT advanced wind turbine gear lubricant offers the following features and benefits:

Features Advantages and Potential Benefits
Superb protection from micropitting fatigue wear as well as high resistance to traditional scuffing wear

Helps extend gear and bearing life in enclosed gear drives operating under extreme conditions of load, speed and temperature

Helps reduce unplanned downtime and maintenance - especially critical for difficult to access gearboxes

Independently certified to not contribute to oil related effects of White Etching Cracks (WEC) Helps reduce unplanned downtime and maintenance from premature bearing failure and gearbox replacement
Outstanding foam protection, even after fine filtration Helps reduce risk of spillage and environmental impact. Reduces/Eliminates turbine trips due to false oil level alarms.
Excellent resistance to degradation at high temperatures Helps reduces oil consumption and maintenance costs through extended oil life and drain intervals
Formulated with proprietary step-out low sulfur Extreme Pressure technology delivering low deposit performance, sludge formation control, and equipment component compatibility Offers better protection of equipment and longer drain intervals for optimized maintenance costs
Outstanding cleanliness level, better than -/14/11 (ISO 4407)

Helps provide smooth, trouble-free operations in all operating conditions

Helps reduce additional on-site filtration and associated costs

Multiple equipment approvals and excellent compatibility with mineral-based gear oils

Provides performance confidence from a wide range of wind turbine OEM builders

Enables consolidated and simplified gear oil inventory management and equipment optimization in mixed turbine operations


Mobil SHC Gear 320 WT advanced wind turbine gear lubricant is recommended for lubrication of the main gearbox in wind turbine power generation systems. It is especially recommended for applications that may be subject to micropitting, especially heavily loaded gearboxes with surface-hardened tooth metallurgies, which are typically used in wind turbines. It may also be used in gear applications where extreme low and/or high temperatures are encountered and applications where corrosion may be severe. Compared to conventional gear oil chemistries, Mobil SHC Gear 320 WT advanced wind turbine gear lubricant can provide improved lubrication of gearbox rolling element bearings.


Typical applications include:

  • Wind turbines, especially highly loaded and shock loaded units, remotely located units and extreme temperature environments
  • Auxiliary gearboxes in wind turbines, such as gearmotors for pitch and yaw drives

Application consideration: while Mobil SHC Gear 320 WT is compatible with mineral oil-based products, it is recommended that systems are thoroughly cleaned out and flushed before switching to Mobil SHC Gear 320 WT to achieve the maximum performance benefits.

Specifications and Approvals

This product has the following approvals:
CN Gpower
GE Renewable Energy
Ishibashi Manufacturing
Mitsubishi Heavy Industries
Mitsui Miike Machinery
ZF Wind Power
This product meets or exceeds the requirements of:
AGMA 9005-F16
DIN 51517-3:2018-09
IEC 61400-4 :2012(E)
ISO L-CKD (ISO 12925-1: 2018)
ISO L-CKSMP (ISO 12925-1: 2018)
Non-toxicity to aquatic organisms according to the GESAMP hazard evaluation procedure

Properties and Specifications

Grade ISO 320
Density @ 15.6 C, g/ml, ASTM D4052 0.851
Emulsion, Time to 37 mL Water, 82 C, min, ASTM D1401 15
Flash Point, Cleveland Open Cup, °C, ASTM D92 256
Foam, Sequence II, Tendency, ml, ASTM D892 0
Foam, Sequence II, Stability, ml, ASTM D892 0
FZG Micropitting, Fail Stage, Rating, FVA 54 >10
FZG Micropitting, GFT-Class, Rating, FVA 54 High
FZG Scuffing, A/8.3/90, Fail Stage, Rating, DIN 51354 14+
Kinematic Viscosity @ 100 C, mm2/s, ASTM D445 44.7
Kinematic Viscosity @ 40 C, mm2/s, ASTM D445 343
Pour Point, °C, ASTM D5950 -45
Rust Characteristics, Procedure B, ASTM D665 PASS
Viscosity Index, ASTM D2270 189
ISO 4406 cleanliness, >5 micron parts, class, ISO 4407 14 max
ISO 4406 cleanliness, >15 micron parts, class, ISO 4407 11 max

Health and safety

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