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Transformer oil

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  • Shell Diala S4 ZX-I

    Shell Diala S4 ZX-I previous Shell Diala B, S2 ZX-I

    Premium insulating oil based on Shell GTL technology for transformers

    Advantages of the Diala S4 ZX-I are:

    • + High Performance, excellent heat transfer and dielectric properties
    • + High Oxidation Stability
    • + Resistance to the effects of ageing, sludge formation and deposit build-up

    Shell Diala S4 ZX-I is Shell's premium insulating oil. It has been designed to meet the needs of the latest transformer generation. The product offers a longer oil life. It is sulfur free and therefore meets existing and future copper corrosion tests. Shell Diala S4 ZX-I is made from a sulfur-free base oil produced using the Shell GTL (Gas-to-liquids) technology. 
    We also know that it is used as Immersion Cooling Fluid for cooling servers as used in cloud computing, blockchain and crypto mining.
    This base oil is characterized by a uniform molecular structure and a very good response of antioxidants. It is globally available and independent of different crude oil deposits due to its manufacturing process. Shell Diala S4 ZX-I is free of PCB, DBDS and Passivators.

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    Starting at: Excl. Tax: £108.25 Incl. Tax: £130.98

  • Total Isovoltine II


    Pure non-inhibited mineral insulating oil.

    Applications TOTAL ISOVOLTINE II
    • ISOVOLTINE II is a non-inhibited naphthenic mineral oil for transformers, rheostats and circuit breakers using mineral oils.

    Your advantage! Price of TOTAL ISOVOLTINE II drops automatically in larger quantities.

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    Starting at: Excl. Tax: £121.25 Incl. Tax: £146.71

  • Q8 Transformer Oil U

    Q8 Transformer Oil U

    Uninhibited transformer oil

    Applications Q8 Transformer Oil U

    This product can be used in all types of oil-filled electrical equipment, including power and distribution transformers and switchgear.

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    Starting at: Excl. Tax: £878.40 Incl. Tax: £1,062.86

  • Shell Naturelle Transformer Fluid S4 I

    Shell Naturelle Transformer Fluid S4 I

    Advanced synthetic electrical insulating fluid

    Applications Shell Naturelle Transformer Fluid S4 I

    Industrial transformers. Electrical insulating fluid for power and distribution transformers, which may have advanced requirements regarding environment and fire protection e.g traction transformers and wind turbine applications.

    Transformers in electrical locomotives. Insulating and cooling fluid for mobile railroad transformers.

    Learn More

    Starting at: Excl. Tax: £8,810.00 Incl. Tax: £10,660.10

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Transformer Oil: The Important Role in High Voltage Applications

Transformer oil, also known as insulating oil, plays a crucial role in high voltage applications. This specific oil is known for its strong insulating and heat-conducting properties, which are essential for the smooth operation of electric transformers and switchgear equipment. At Olie Online, we offer various quantities and brands of transformer oil to meet your specific needs.

What is Transformer Oil?

Transformer oil is a carefully refined, pure oil with an extremely low sulfur content. It is enriched with antioxidant additives to enhance durability and stability. This oil is specially designed for use in electric transformers and switchgear equipment, where it serves as an insulating and heat-dissipating medium.

Key Properties of Transformer Oil:

  1. Insulation: Transformer oil provides excellent insulation properties, effectively conducting electric current without leakage or short-circuits.

  2. Heat Dissipation: The oil acts as a heat-dissipating medium, keeping the internal temperatures of the transformer within acceptable levels.

  3. Stability: The low sulfur content and added antioxidant additives ensure the stability of the oil, even under extreme conditions.

Where to Buy Transformer Oil?

At, you will find an extensive selection of transformer oils from various brands and in various quantities. Our goal is to meet your specific requirements and ensure that you can find the right oil for your high voltage applications.

Need Help Choosing Transformer Oil?

We understand that selecting the right transformer oil is crucial for the efficiency and reliability of your electrical equipment. If you have questions or are unsure about the most suitable transformer oil for your application, do not hesitate to contact us for expert and non-binding advice. You can also take advantage of our convenient online oil selector to quickly find the right product.

Questions About Transformer Oil:

Why are insulation and heat-conducting properties important for transformer oil?

Insulation and heat-conducting properties ensure that electric current is effectively conducted, and internal temperatures in electric transformers remain within acceptable limits.

What are the benefits of the low sulfur content and antioxidant additives in transformer oil?

The low sulfur content and antioxidant additives contribute to the stability of the oil, even under extreme conditions, improving the durability and reliability of high voltage applications.