Summary
Castrol ON PG25 coolant data, from Castrol's own source. Castrol ON PG25 is a premix (ready to use) OAT propylene glycol-based coolant listed by Castrol. The manufacturer's page we checked does not list OEM spec codes.
Confirm the exact fluid and qualification with your CDU or hardware supplier before specifying.
Specifications
| Brand | Castrol |
|---|---|
| Maker | Castrol |
| Product | Castrol ON PG25 |
| Chemistry | OAT |
| Base glycol | Propylene glycol |
| Premix or concentrate | Premix (ready to use) |
| Not published by the maker | Part numbers, Sizes, Colour, OEM / industry specs, ASTM standards, Service life claim, Freeze point, Free-of claims, Datasheet. Check the product label or ask the manufacturer. |
| Source | manufacturer page |
| Last checked | 22 October 2026 |
Specs and approvals listed by the manufacturer
No OEM approval or spec codes are published on the source we checked. That does not mean the product fails any spec. It means the manufacturer did not list one there. Check the product label or ask the manufacturer.
Compatibility notes
- Chemistry is listed as OAT. Mixing different chemistries can shorten coolant life. See OAT vs HOAT vs IAT and use the mixing checker before topping up.
- Sold premixed: pour as supplied. Do not add water unless the label says to.
- Data-center fluid: use only where the CDU and hardware vendor approve it. See the liquid cooling hub and the DC coolant comparator.
Note: Data-center direct-to-chip fluid. Base: Propylene glycol (PG25, pre-diluted). See /suppliers/ and the DSX Ready guide for context.
Where to buy
We did not find a retailer link on the manufacturer's page that we could check. Try the manufacturer's own site: Castrol product page.
Related tool
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- ZITREC EC (direct-to-chip range) (Arteco, not published)
More from Castrol
See every Castrol product we list, with the chemistries and spec codes the maker names, on the Castrol coolant brand page.
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- Facts come from manufacturer pages, datasheets, owner's manuals and standards bodies, linked under Sources.
- We do not test products, and no brand pays to be listed or ranked. Advertising and affiliate links are labelled and never change the data.
- Anything we could not find is marked "not published" rather than guessed. Spotted an error? Tell us.