The Best Coolants for UK Drivers in 2025

You’ve checked your oil, topped up your screenwash, and given your tyres a once over. But how often do you think about what’s running through your radiator?

If your answer is “rarely”, you’re not alone. Coolant might not get much glory, but it plays a critical role in keeping your engine in top nick, especially with the unpredictable UK weather.

In 2025, with more advanced engines and ever changing temperatures, choosing the right coolant is more than just grabbing the nearest bottle off the shelf.

So, here’s the lowdown on the best coolants available to British drivers this year and why it pays to care what’s in your expansion tank.

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Why Coolant Matters

Coolant (or antifreeze, if you prefer the old school term) isn’t just for keeping things from freezing in winter. Its job is twofold:

1. Prevent the engine from overheating in summer.

2. Stop the coolant system from freezing or corroding in winter.

Modern engines run hotter than ever, and with smaller radiators and tighter tolerances, poor coolant can mean warped engine blocks, blown head gaskets, or worse.

So, what makes a good coolant in 2025? Let's dive in.

Types of Coolant Explained

Before you reach for a bottle, know what you’re pouring in. Coolants come in three main types:

• IAT (Inorganic Additive Technology): The old school green stuff, needs changing every 2 years. Rarely used in modern motors.

• OAT (Organic Acid Technology): Usually orange or pink. Longer lasting, typically up to 5 years. Common in many modern cars.

• HOAT (Hybrid Organic Acid Technology): A mix of IAT and OAT. Often yellow or turquoise. Suits some European models.

Always check your owner’s manual or consult your mechanic before switching types; mixing them can gum up your system.

Best Coolants for UK Drivers in 2025

Here’s a rundown of some top performing coolants this year, based on compatibility, corrosion protection, longevity, and cold weather resilience.

1. Comma G30 Antifreeze & Coolant (OAT)

• Best for: VWs, Audis, Skodas, and SEATs

• Why it stands out: G30 is a long life OAT coolant designed specifically for VAG group cars. It offers top tier protection down to -36°C and resists scaling and corrosion.

• Workshop verdict: Clean, reliable, and fully compatible with pink G12/G12++ coolants. Don’t mix with G13.

2. Prestone All Vehicles Ready to Use (HOAT)

• Best for: Most petrol and diesel vehicles

• Why it stands out: This universal option is suitable for all cars and is pre mixed, so no faffing with dilution. Offers protection from -37°C to +129°C.

• Workshop verdict: Great for top ups in a pinch. If you're unsure of what's in your system, Prestone is a safe bet, though it’s best to flush old coolant if changing type.

3. Triple QX Red Long Life (OAT)

• Best for: Budget conscious drivers with modern engines

• Why it stands out: Offers solid corrosion resistance, is MEG free (no ethylene glycol), and lasts up to 5 years.

• Workshop verdict: Ideal for routine servicing on newer cars without splashing the cash.

4. Ford Super Plus Premium (HOAT)

• Best for: Ford models and cars needing WSS M97B44 D spec

• Why it stands out: Designed specifically for Ford engines, it provides enhanced aluminium protection and extends water pump life.

• Workshop verdict: Ford owners, stick with what’s engineered for your engine. This stuff works well and keeps warranty worries at bay.

5. Mannol Antifreeze AG13+ (Silicate Hybrid)

• Best for: Older European models (BMW, Mercedes, Opel)

• Why it stands out: Offers hybrid silicate tech with extended drain intervals and frost protection down to -40°C.

• Workshop verdict: A solid choice for older vehicles needing hybrid formulations without clogging newer systems.

When to Change Your Coolant

Even the best coolant breaks down over time. For most cars, that’s every 3 to 5 years or 30,000 to 60,000 miles, whichever comes first. Signs you might be overdue include:

• Rusty or brown coolant

• Coolant leaks or white crust around the radiator cap

• Engine running hotter than usual

• Low coolant warning light (don’t ignore it)

Flushing your system and topping up with the right coolant will save you from pricey repairs down the road.

Common Mistakes to Avoid

Even savvy drivers get tripped up now and then. Here are some blunders to steer clear of:

• Mixing coolants: Different formulations can react and cause sludge. Always flush before switching types.

• Using plain water: Tap water introduces scale and corrosion. Use distilled water if diluting.

• Ignoring leaks: That slow drip might mean a failing water pump, head gasket or radiator hose. Nip it in the bud.

• Topping up with any colour: Colour isn’t a reliable indicator of type. Always check the spec.

Final Thoughts

Coolant might seem like just another fluid, but it’s a workhorse behind the scenes. Whether you're driving a 15 year old Fiesta or a brand new hybrid, keeping your cooling system healthy is one of the smartest moves you can make.

Stick to the right spec, flush your system when needed, and don’t cheap out, and your engine will thank you with smooth, reliable performance.

Mike Floyd

Senior Maintenance Editor, Car Care Column