Pylon with a Transformer and the Shell Diala logo over it

Shell Diala Transformer Oils

Key Benefits¹

  • Icon of spanner on top of screwdriver

    Enhanced Protection

    Extend the operational lifetime of your transformers with a range of oils designed to keep your components in service for longer.

  • Icon of oil cannister pouring oil on gear

    Longer oil life

    Extend oil drain intervals to maximise the potential of your equipment and keep it running at peak productivity with longer oil life.

  • Gear

    Exceptional performance

    Provide excellent protection for your transformers under higher loads and across a wide range of operating temperatures.

  • Icon of a corroded piece of metal

    Resistance to corrosion

    Eliminate the risk of oil-related copper corrosion from sulphur build-up with transformer oils that are effectively sulphur free.

  • Icon of weight

    Consistent reliability

    Avoid unplanned downtime to maintain the reliability and efficiency of your operations with the best possible protection for all applications.

  • Icon of chemical compound

    Operational Simplicity

    Choose the right transformer oils with confidence, from a range of fluids designed to match your specific needs.

2 builders in hardhats staring at a laptop
Transformer oils and GTL technology

Oils based on gas-to-liquid (GTL) technology provide an effective choice of lubrication for use with electrical equipment – from distribution transformers to high-voltage, direct current transformers.

GTL transformer oils – such as Shell Diala S4 ZX-I, Shell Diala S4 ZX-IG and Shell Diala S5 BD – offer some clear improvements over conventional mineral-based products. As well as helping to enhance the protection of your transformer components, they can increase the efficiency of your equipment – including in low-temperature conditions.

Transformer oils based on GTL technology also provide you with consistent performance, helping you to increase the reliability of your equipment. Plus, they are simple to introduce to your lubrication systems due to their compatibility with most conventional transformer oils.

Pylon in a field with crops
Demonstrate your sustainability credentials with Shell Diala S5 BD

As electricity demand continues to grow, power generation is expanding into diverse and often ecologically sensitive locations. Making sure that your transformers on these sites have a high standard of environmental protection is critical.

A key element of this is biodegradability. From offshore wind to solar farms in the desert, it is important to protect the surrounding natural environment – and reduce the impact of unexpected leaks.

Shell Diala S5 BD is designed to be a high-performance, readily biodegradable oil that gives you peace of mind in operations where performance and environmental impact are both critical priorities. Meeting, and exceeding, industry-standard tests, it helps you to drive the efficiency of your operations while also demonstrating your sustainable credentials.

A step closer to a sustainable transformer

By enabling equipment to handle harsh, cold climates and new environmental needs, Shell Diala S5 BD supports transformer operators in overcoming the biggest challenges they currently face.

Shell Diala S5 BD was successfully tested by Siemens Energy for TenneT’s transformer substation in Schwandorf – currently the biggest three-phase TenneT grid transformer in Germany.

Download press release for more information

Make a positive impact with Shell Diala S5 BD

  • Transformer oil brochure with Pylon in the middle

    Drive performance and sustainability

    Find out how you can meet growing demand for energy without compromising on sustainability by using Shell Diala S5 BD.

    Download Shell Diala S5 BD infographic

  • Transformer oil brochure with Solar panels at the bottom

    Protect environmentally sensitive locations

    Explore the positive difference a high-performance, readily biodegradable transformer oil can make to your environmental impact.

    Download Shell Diala S5 BD infographic

  • Transformer oil brochure with transformer at the bottom

    Improve cold temperature performance

    See how to overcome the challenges of operating in extreme low temperatures with lubrication that works in the harshest conditions.

    Download Shell Diala S5 BD infographic

Explore the Shell Diala range

Download our brochure to find out how the Shell Diala range of transformer oils can improve your operational efficiency while reducing costs.

Download product range brochure

Success Stories

  • Brochure with Builder wearing a hardhat

    Reducing equipment costs in Germany

    Discover how a German manufacturer was able to save $250,000 through optimisation enabled by Shell Diala.

    Download our case study

  • Brochure with Builder wearing a hardhat

    Driving low-temperature performance in China

    See how Shell Diala improved reliability and reduced transformer operating costs by 68% for one energy company.

    Download our case study


1 All data shown is derived from tests in laboratories at Shell Lubricant Solutions or partners using accepted standard methods

* Shell Diala S4 ZX-I, Shell Diala S4 ZX-IG & Shell Diala S5 BD meet or exceed the specification of IEC60296 Ed5 (2020). For more product specific information, please visit for more details.

Related Content

Lubricants for Wind Power

Designed to thrive in remote locations and developed to perform in extreme conditions. Explore our range of specialised wind power solutions.

Shell Omala Gearbox Oils

Drive system efficiency, increase productivity and reduce your total cost of ownership with the Shell Omala range of gearbox oils.

Transmission & Distribution

Modern transformers are facing increased loads and higher voltages. Do your lubricants provide the protection they need to perform?