Castrol ON PG25T: specs and approvals

Updated 22 October 2026 · Independent, sourced reference

Summary

Castrol ON PG25T coolant data, from Castrol's own source. Castrol ON PG25T is a premix (ready to use) IAT propylene glycol-based coolant listed by Castrol. The manufacturer's page we checked does not list OEM spec codes.

Independent and not affiliated. Coolant.com is not affiliated with, sponsored by or endorsed by any coolant or vehicle maker or retailer listed here, and we earn nothing from these links. Brand and spec names are used only to identify products. Every field comes from the manufacturer's own page or datasheet, checked 22 October 2026. "Not published" means we could not find it in that source. We record no prices.

Specifications

BrandCastrol
MakerCastrol
ProductCastrol ON PG25T
Part numbers (as published)not published
Sizes (as published)not published
ChemistryIAT
Base glycolPropylene glycol
Colournot published
Premix or concentratePremix (ready to use)
OEM / industry specs listednot published
ASTM standards listednot published
Service life claimnot published
Freeze point (as published)not published
Free-of claimsnot published
Datasheetnot published
Sourcemanufacturer page
Last checked22 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 IAT. 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.

Always check your owner's manual first. Use the coolant spec printed in your owner's manual or service information. A listing here is the manufacturer's own claim (meets, exceeds, approved or recommended, worded as they put it). It is not our approval and not a fitment guarantee for your vehicle. If in doubt, ask your dealer or a qualified mechanic.

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.

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Sources

  1. Castrol product page (status on 22 Oct 2026: 200)