What coolant does my car need?

Confirm the specification in your owner’s manual before buying. Product examples are not a fitment guarantee.

The short answer: match the spec, not the color

When people search "what coolant does my car take", they are usually standing in a store aisle facing dozens of bottles in green, orange, pink, blue and yellow. The bottles that look alike are often not alike at all. Engine coolants are built around corrosion-inhibitor packages, and those packages differ by chemistry. The common families are IAT, OAT, HOAT, P-HOAT and Si-OAT; our guide to coolant types explains each one. Vehicle makers test and approve particular chemistries for their engines, gaskets, radiators and heater cores. That approval is written down as a specification.

So the job is not finding "the best coolant". It is finding the coolant that meets your vehicle's specification. Once you have the spec, the choice is quick: any coolant whose label claims that spec is a candidate. Then pick premix or concentrate, and the size you need.

Step 1: find the coolant spec in your owner's manual

Open the owner's manual and look in the sections called Capacities and specifications, Fluids and lubricants or Maintenance. The coolant line usually contains one or more of these:

Write the spec down exactly, or take a photo. If the manual gives a capacity, note that too; it tells you how much to buy for a full refill. Many vehicles also have the coolant type printed on the reservoir cap or on a label under the hood.

Step 2: match the spec on the coolant label

Turn the bottle around. Reputable coolants print the specifications they meet or are approved for on the back label. You're looking for the same number or technology you found in step 1. A few practical rules:

• "Meets" vs "approved": "approved" or "licensed" means the carmaker has formally signed off. "Meets" or "suitable for" is the coolant maker's own claim. Both are common; "approved" carries more weight.
• Same technology, different brand: usually acceptable if the spec matches. Check that the spec number appears, not just the chemistry name.
• Universal / all makes, all models: read which specs are listed. If yours isn't there, choose another product.
• Heavy-duty coolants (ASTM D6210) are formulated for diesel engines with wet cylinder liners. See our heavy-duty coolant guide. Use one in a car only if your manual allows it.

If you can't find your exact spec on any bottle, the carmaker's own branded coolant from a dealer parts counter is the safe fallback.

Step 3: choose premix or concentrate

Coolant is sold as concentrate (pure antifreeze plus inhibitors) or premix, which is already diluted, typically 50/50, with purified water. For a top-up, premix is easier and avoids getting the ratio wrong. For a full refill, concentrate can be better value per mixed litre, but you have to dilute it with distilled or deionized water. The full comparison, including freeze protection by ratio, is in premix vs concentrate.

A 50% ethylene glycol mix protects to about −37 °C (−34 °F) at atmospheric pressure, according to published glycol tables [1]. Raising the glycol share helps only up to a point. Past roughly 60–70%, freeze protection gets worse. Try other ratios in the calculator below.

Why coolant color is not a reliable guide

Dye color is chosen by each coolant maker. No industry standard links a color to a chemistry. Orange might be OAT from one maker and something else from another. Green was traditionally conventional IAT, but some modern long-life coolants are green too. Pink, blue and purple are all used for different OEM-specific formulas. Our coolant color guide explains what each color often means, and why "often" is the most you can say.

The color in your reservoir also changes with age and contamination. Old coolant can turn brown or murky, which hides the original dye. Never decide what to add by matching the color in the tank.

Decision checklist: which coolant should I buy?

• I found the coolant spec in my manual, on the reservoir cap or under-hood label, or from a dealer using my VIN.
• The coolant label lists that exact spec or approval.
• I know whether I'm topping up (premix is simplest) or refilling (concentrate or premix).
• I know my system capacity (from the manual) for a full refill.
• If the system holds an unknown coolant, I'll drain and refill rather than mix.
• I have distilled or deionized water if I'm using concentrate.

No manual? How to find your coolant spec

1. Search the carmaker's owner website. Many publish manuals for free by model and year.
2. Call a dealer parts or service desk with your VIN and ask for the coolant part number and spec.
3. Check the reservoir cap and the under-hood labels.
4. Ask the shop that last serviced the cooling system what they used.

Avoid guessing from online forum threads for a "similar" model. Engines in the same model range can need different coolants.

All-makes coolant and spec codes

Before you buy an "all makes" bottle, read does universal coolant work?, which quotes Ford's own position, and look up your code in coolant specs explained.