Name: Castrol ON PG25
Brand: Castrol

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.

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

Brand	Castrol
Maker	Castrol
Product	Castrol ON PG25
Part numbers (as published)	not published
Sizes (as published)	not published
Chemistry	OAT
Base glycol	Propylene glycol
Colour	not published
Premix or concentrate	Premix (ready to use)
OEM / industry specs listed	not published
ASTM standards listed	not published
Service life claim	not published
Freeze point (as published)	not published
Free-of claims	not published
Datasheet	not published
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.

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.

Compare this coolant side by side

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ZITREC EC (direct-to-chip range) (Arteco, not published)

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Browse the full coolant directory, or use Find my car coolant to match the spec in your owner's manual.

Sources

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

Castrol ON PG25: specs and approvals