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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. 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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Select quantity
Qty Packsize Price/L
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Excl. VAT
Incl. VAT
- + Barrel 209L £ 0,00 £ 625,56 £ 0,00
- + Pail 20L £ 0,00 £ 91,50 £ 0,00

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4x 5L £ 0,00 £ 99,90 £ 0,00
£ 0,00

Free delivery over 150L

Product Description


Features Shell Diala S4 ZX-I

+ Extended oil life

Shell Diala S4 ZX-I is an inhibited insulating oil that performs exceptionally well in industry-standard oxidation tests and provides extended oil life. It is particularly suitable for use in high-load applications.

+ transformer protection

Shell Diala S4 ZX-I is made from a sulfur-free * base oil, which significantly reduces the risk of copper corrosion, even without the addition of passivators or other additives.
All relevant copper corrosion tests are met: DIN 51353 (silver strip test), ASTM D1275 and the new tests IEC 62535 and ASTM D1275B. More reliability due to a higher flash point. * Sulfur content is below 1 ppm (detection limit of · ASTM D5185).

+ System Efficiency

The very good flowability at low temperatures of Shell Diala S4 ZX-I enables safe heat transfer in transformers, even at low starting temperatures.
Shell Diala S4 ZX-I is manufactured and dried by a special process, which gives it a low water content and a high breakdown voltage on delivery. This allows the use of the oil without additional "drying" in many applications.

Specifications, Approvals and Recommendations

- IEC 60296 (2012): Table 2 Transformer Oils (I) (Inhibited Oils) Section 7.1 ("High Oxidation Stability & Low Sulfur Content")
For a list of all OEM approvals and recommendations, please contact your Shell representative.

Analysis figures and physical properties Shell Diala S4 ZX-I

Properties Method IEC Table 2 + section 7.1 minimum IEC Table 2 + section 7.1 maximum Shell Diala S4 ZX-I Typical
Appearance IEC 60296 Clear, free of sediment and suspended matter /s Clear, free of sediment and suspended matter Fulfills
Density at 20C ISO 3675 - 895 805
Kinematic viscosity at @ 40 C mm 2 /s ISO 3104 - 12 9.9
Kinematic viscosity at -30 C mm 2 /s ISO 3104 - 1 800 523
Flash point P.M. C ISO 2719 135 - 191
Freezing point ISO 3016 - - 40 - 42
Neutralization value mg KOH /g IEC 62021-1 - 0.01 0.01
Total Sulfur Content mg /kg ASTM D5185 - Section 7.1 limit 500 1
Corrosive Sulfur DIN 51353 - Not corrosive Not corrosive


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Additional Information

Additional Information

Brand Shell
ACEA DIN ISO OEM ASTM D 1275B, DIN 51353 (Silver Strip Test), IEC 60296 (2003) tabel 2 ongedoopte transformator olie (U), IEC 62535
OEM Approval siemens, wartsila