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Antifreeze and Coolant: Why the Colour Matters

Contrary to popular belief, a coolant's colour isn't decorative: it corresponds to a formulation family (anti-corrosion additives) that must be compatible with your vehicle's cooling circuit.

2026-09-15·4 min read

Why colours indicate different formulations

Manufacturers use dyes to distinguish antifreeze technology families (IAT, OAT, HOAT), each using different anti-corrosion additives suited to specific cooling-circuit materials (aluminium, mixed alloys).

How to choose between BLUE, YELLOW, PINK and GREEN ANTIFREEZE

The colour suited to your vehicle is listed in the owner's manual. If in doubt, never mix two different colours when topping up: fully flush and replace the circuit with the appropriate reference to avoid any chemical reaction between incompatible additives.

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Frequently Asked Questions

In Short

Can two antifreeze colours be mixed?

No, this can degrade the anti-corrosion properties of both products and damage the cooling circuit over time.

How often should coolant be replaced?

Generally every 2 to 5 years depending on the formulation and manufacturer guidance — check your vehicle's service book.

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