Best 5 Car Coolants & Antifreeze Fluids in 2026
Choosing the right engine coolant is just as important as choosing the right engine oil. A quality coolant helps regulate engine temperature while protecting the radiator, water pump, cylinder head and other cooling-system components against freezing, overheating, corrosion and deposits. However, coolant specifications are not interchangeable, so always check your vehicle owner’s manual before mixing or replacing coolant. (LIQUI MOLY Iberia)
1. Castrol Radicool SF
Castrol Radicool SF is a long-life coolant based on monoethylene glycol and advanced organic-acid inhibitor technology. It is free from amines, nitrites, phosphates and silicates and is designed to provide corrosion protection for cooling systems containing aluminium, cast iron and copper components. It meets specifications including ASTM D3306, ASTM D4985, ASTM D6210, MAN 324 Typ SNF, MB 325.3 and VW TL 774F (G12+). Castrol also states that the product can provide freezing protection down to approximately -36°C when correctly diluted, making it suitable for a wide range of climates. (Home)
Buy on Amazon EU: Castrol Radicool SF – Amazon.de
2. LIQUI MOLY KFS 12++
LIQUI MOLY KFS 12++ is a hybrid-technology coolant designed for modern cooling systems that require the VW/Audi TL 774-G (G12++) specification. Its ethylene-glycol formulation is free from amines, borates, nitrites and phosphates and provides protection against frost, overheating and corrosion. LIQUI MOLY lists compatibility with VW TL 774 G, Audi TL 774 G, Seat TL 774 G, Skoda TL 774 G, MB 325.5/325.6 and MAN 324 Si-OAT. The concentrate can be mixed with water according to the required freezing protection; a 1:1 mixture provides protection down to around -40°C. (pim.liqui-moly.de)
Buy on Amazon EU: LIQUI MOLY KFS 12++ – Amazon.de
3. MOTUL INUGEL EXPERT
MOTUL INUGEL EXPERT is a long-life coolant based on organic additive technology and is designed to protect the cooling system against corrosion, freezing and overheating. It is intended for a wide range of passenger cars and is particularly useful where an OAT-type long-life coolant is specified. Motul’s Inugel range is also used in European automotive applications, while DAF’s approved coolant list includes Motul Inugel Optimal/Inugel Optimal Ultra, illustrating the brand’s presence in OEM-oriented cooling-system applications. Always match the exact Inugel product and specification to the vehicle before filling. (daf.com)
Buy on Amazon EU: MOTUL INUGEL coolant – Amazon.de
4. BASF Glysantin G40
BASF Glysantin G40 is a premium long-life coolant based on Si-OAT technology, combining organic corrosion inhibitors with silicate protection. It is designed to provide long-term protection against corrosion and deposits while maintaining effective heat transfer and frost protection. Glysantin products are used across European automotive applications, and Glysantin G40 appears on DAF’s list of approved coolants. Because different Glysantin products have different OEM specifications, the exact G40 approval required by your vehicle should be checked before purchase. (daf.com)
Buy on Amazon EU: BASF Glysantin G40 – Amazon.de
5. Shell Glycoshell
Shell Glycoshell is a coolant/antifreeze product designed to protect cooling systems from corrosion, freezing and overheating while helping maintain effective engine-temperature control. Shell’s coolant products are intended for automotive and other engine applications, but the correct formulation and concentration must be selected according to the vehicle manufacturer’s specification. As with all antifreeze products, do not choose coolant simply because it has the same colour as the coolant already in the vehicle—the OEM specification is much more important than colour.
Buy on Amazon EU: Shell Glycoshell coolant – Amazon.de
How to Choose the Right Coolant in 2026
The most important point when buying coolant is to match the manufacturer specification, not simply the colour or brand. For example, G12+, G12++, G13 and Si-OAT/OAT represent different coolant technologies and specifications, and they should not automatically be mixed. If you are changing from one coolant technology to another, flushing the cooling system may be required according to the vehicle manufacturer’s instructions. (LIQUI MOLY Iberia)
| Coolant | Technology | Key specification / feature |
|---|---|---|
| Castrol Radicool SF | OAT | VW TL 774F (G12+), MB 325.3 |
| LIQUI MOLY KFS 12++ | Hybrid / Si-OAT | VW TL 774G (G12++) |
| MOTUL INUGEL | Long-life coolant | European/OEM-oriented applications |
| BASF Glysantin G40 | Si-OAT | Long-life European applications |
| Shell Glycoshell | Antifreeze/coolant | Cooling & corrosion protection |
Important note about the Amazon links
I have deliberately used Amazon.de search links rather than fixed ASIN links. Amazon product pages can change because of seller, package size and stock changes. I checked the current Amazon search destinations, but Amazon’s search pages were not directly accessible to my web verification system at this moment, so I cannot honestly guarantee that a specific seller or package is in stock right now. The links themselves are stable Amazon.de search links and should open the relevant product search rather than an expired individual listing.
