
Shell Diala Transformer Oils

Enhance your transformer operations without compromise
Shell Diala represents a range of high-performance transformer oils, including fluids based on gas-to-liquid (GTL) technology, that helps you to contribute to meeting the growing global demand for energy. Offering enhanced protection, longer oil life and greater system efficiency, they maximise equipment performance to overcome challenges like increased loads and higher voltages.
Key Benefits¹
Enhanced Protection
Extend the operational lifetime of your transformers with a range of oils designed to keep your components in service for longer.
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.
Exceptional performance
Provide excellent protection for your transformers under higher loads and across a wide range of operating temperatures.
Resistance to corrosion
Eliminate the risk of oil-related copper corrosion from sulphur build-up with transformer oils that are effectively sulphur free.
Consistent reliability
Avoid unplanned downtime to maintain the reliability and efficiency of your operations with the best possible protection for all applications
Operational Simplicity
Choose the right transformer oils with confidence, from a range of fluids designed to match your specific needs.
Biodegradability profile
The base oils used in Shell Diala S4 ZX-I/ZX-IG and Shell Diala S5 BD are readily biodegradable according to OECD 301 test criteria, breaking down faster than conventional mineral oil.

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.
Demonstrate the benefits of Shell Diala S5 BD
As electricity demand continues to grow, power generation is expanding into a wider range of operating locations. In these applications, operators may consider fluid characteristics beyond technical performance, including how a fluid behaves if accidentally released.
A key consideration can be biodegradability. From offshore wind installations to solar facilities, selecting fluids tested against ready biodegradability criteria(i.e OCED 301 series) may help reduce the persistence of leaked fluid following an accidental release.
Shell Diala S5 BD is a high-performance transformer fluid formulated with base oils that meet ready biodegradability criteria under OECD 301 test methods. It is designed to deliver reliable transformer performance while providing an option for applications where biodegradability is an important consideration.
By combining proven transformer fluid performance with base oils that meet ready biodegradability criteria under OECD 301 test methods, Shell Diala S5 BD offers customers an additional choice within the Shell Diala portfolio for applications where persistence following an accidental release is a consideration in fluid selection.


A step closer to meeting evolving transformer requirements
By helping equipment operate in low-temperature conditions and supporting the needs of regulated and demanding applications, Shell Diala S5 BD is designed to help transformer operators address a range of operational challenges.
Shell Diala S5 BD was successfully tested by Siemens Energy for TenneT's transformer substation in Schwandorf, including use in what is reported to be TenneT's largest three-phase grid transformer in Germany.
Make a positive impact with Shell Diala S5 BD

Improve cold temperature performance
See how to overcome the challenges of operating in extreme low temperatures with lubrication that works in the harshest conditions.
Disclaimers:
1All 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 www.epc.shell.com for more details.

