
Introducing Diala S5 BD
Shell Diala S5 BD is a biodegradable oil for advanced transformer performance, offering reliable protection for the environment and your equipment. Moreover, Shell Diala S5 BD transformer oil is also designed to provide excellent cold temperature performance, so your equipment can thrive in both the harshest and the most environmentally sensitive locations. To learn more, please reach out via the Contact Us form below.
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Drive performance and sustainability
Find out how you can meet growing demand for energy without compromising on sustainability by using Shell Diala S5 BD.

Protect environmentally sensitive locations
Explore the positive difference a high-performance, readily biodegradable transformer oil can make on your environmental impact.

Improve cold temperature performance
Overcome the challenges of operating in extreme low temperatures with lubrication that works in the harshest conditions.

Shell Diala S5 BD Brochure
A readily biodegradable transformer oil with excellent cold temperature performance, providing protection and efficiency to transformers across the globe.

Shell Diala S5 BD white paper
Readily biodegradable, low aquatic ecotoxicity, and recyclable dielectric coolant.
High quality formulation
Exceeds interfacial tension, sulfur free, prevents paper degradation, outstanding oxidation stability
Cold temperature performance
Suitable for extremely cold and arctic conditions
Low pour point
Less than -51°C
Good flow properties
Viscosity at -40°C < 1,000 mm2/s
Secure supply
Supply security with local production and distribution
Sustainable
Readily biodegradable, recyclable, long oil life and longer equipment life as exceeds IEC 60296 (high grade)
Specifications & Approvals
- ASTM 3487 Type II (Inhibited)
- IEC 60296 Ed5 (2020); Type A, fully inhibited high-grade oils
- CAN/CSA-C50-14 (R2018) Table 1 (Class A), Type II/IV (Inhibited)