Shell Diala S4 ZX-I – Bulk Delivery
Shell Diala S4 ZX-I premium inhibited GTL transformer oil in bulk road tanker delivery. Authorised Shell distributor. Request a quote for volume and site.
Genuine, manufacturer-sealed stock. Tell us the pack size and delivery address and we reply with price and lead time.
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Shell Diala S4 ZX-I in bulk road tanker delivery, supplied by Harlow Lubricants as an authorised Shell distributor. For transformer filling, refilling after refurbishment, or programmed oil replacement across multiple substations, bulk is normally the better option on both unit cost and handling. Formerly sold as Shell Diala S3 ZX-IG.
Genuine Shell product direct from the manufacturer’s supply chain. Data sheet and certificate of conformity supplied with every load.
Shell Diala S4 ZX-I bulk – summary
| Product | Shell Diala S4 ZX-I |
| Previous name | Shell Diala S3 ZX-IG |
| Type | Premium inhibited electrical insulating oil, GTL (gas-to-liquid) base |
| Specification | IEC 60296 Edition 5 (2020) Type A; IEC 60296 Ed.4 (2012) Table 2 Transformer Oil (I), Section 7.1 |
| Format | Bulk road tanker (this page); also 209 L drum and 20 L |
| Supplied by | Harlow Lubricants Supplies, authorised Shell distributor, London NW4 |
What do you need to quote a bulk delivery?
Volume, delivery site or sites, and the date window. Access matters for tanker deliveries, so tell us about the site — hardstanding, turning space, hose run to the fill point, and whether you need the oil delivered into a transformer, into site storage, or into your own IBCs. If the work is part of a wider substation programme we can phase deliveries against your schedule.
Water content limits are tighter for bulk than for drums under IEC 60296 — a maximum of 30 mg/kg against 40 mg/kg — which is one reason bulk handling and storage discipline matters on insulating oil in a way it does not on a lubricant.
Is it suitable for tendered and framework supply?
Yes. Utility and infrastructure tenders for transformer oil commonly require the supplier to be the manufacturer or their authorised dealer or distributor, with evidence of prior supply at volume. Harlow Lubricants Supplies has 35 years of trading behind it and holds authorised distributor status with Shell, so we can supply authorisation documentation alongside the quote. Send the specification and the pre-qualification requirements with your enquiry.
Why Diala S4 ZX-I for bulk programmes?
It is a GTL-based inhibited oil with essentially zero sulphur — below the 1 ppm ASTM D5185 detection limit against an IEC limit of 500 mg/kg — which removes the oil-related copper corrosion risk and passes DIN 51353, ASTM D1275, ASTM D1275B and IEC 62535 as non-corrosive. It exceeds the 500-hour oxidation stability requirement, so service life is long, which is the main cost driver on a large fill. It is also readily biodegradable, which is relevant for environmentally sensitive sites.
Price and delivery
Bulk pricing is quoted per load against current base oil markets, volume and destination. Send the volume and site details and we will come back with a price, stock position and lead time. UK delivery and export to Nigeria, Ghana, Kenya and South Africa. See the full transformer oil range.
