What Type of Coolant Does Audi Use?

Audi specifies modern, silicate‑free, OEM-approved engine coolants based on ethylene glycol, sold under Volkswagen Group standards such as G12, G12+, G12++ and especially the current G13 and G12evo coolants. In practice, Audi uses (and recommends) only VW/Audi–approved pink/purple long‑life coolant that meets the exact VW TL 774 specification for your particular model year and engine, and it must be mixed correctly with demineralized water.

Why Coolant Choice Matters for Audi Vehicles

For Audi engines, coolant is more than a colored liquid that prevents freezing. It is a precisely formulated chemical package designed to protect aluminum blocks, cylinder heads, turbochargers, and complex cooling circuits used in modern combustion, hybrid and electric Audi models. Using the wrong coolant, or mixing incompatible types, can lead to corrosion, sludge, overheating, and expensive repairs that are not covered under warranty.

The Main Types of Audi / VW Coolants

Audi’s coolant portfolio has evolved over time under the Volkswagen Group’s TL 774 standard, which defines the chemistry, corrosion protection, and service life. The brand names and colors can be confusing, but the underlying standards and generation labels (G11, G12, G12+, G12++, G13, G12evo) are the key.

Historical Overview: From G11 to G13 and G12evo

Understanding earlier coolant types helps explain why Audi insists on specific, newer formulations for modern engines and cooling systems.

• G11 (VW TL 774-C) – Older, blue/green, silicate-based coolant used in 1980s–1990s VAG cars. Not used in modern Audis and generally not recommended for mixing with later coolants.
• G12 (VW TL 774-D) – Red/pink, organic acid technology (OAT), silicate-free. Introduced to improve long-term corrosion protection, especially for aluminum. Mixing with G11 commonly caused sludge and deposits.
• G12+ (VW TL 774-F) – Pink/violet hybrid OAT coolant. It was designed to be backward compatible and mixable with both G11 and G12.
• G12++ (VW TL 774-G) – Violet hybrid OAT coolant with improved stability and corrosion resistance. Approved for many late-2000s and early-2010s Audis.
• G13 (VW TL 774-J) – Purple, based on glycerin rather than only ethylene glycol, introduced to reduce environmental impact and CO₂ footprint while maintaining protection. Used extensively in mid‑2010s to recent Audi models.
• G12evo (VW TL 774-L) – A newer evolution coolant designed for the latest Audi/VW engines, including many from around 2020 onward. Typically pink/violet, with a long service life and very specific corrosion‑control chemistry.

Taken together, these coolant generations show a clear trend: from older, silicate-rich formulas toward long-life, silicate‑optimized, OAT or hybrid OAT coolants that precisely match the needs of high‑output, aluminum‑intensive Audi powertrains.

The Coolants Audi Uses Today

Most current Audi models, including internal-combustion, mild hybrid, plug‑in hybrid and many EV platforms, are filled from the factory with either G13 or G12evo coolant (or regionally equivalent VW-Audi branded products meeting the same VW TL 774 standard).

G13: The Widely Used Modern Audi Coolant

G13 is the most common “modern” Audi coolant in circulation and remains widely used for service in many vehicles on the road.

Key characteristics of G13 coolant include:

• Chemistry: Glycerin/ethylene glycol base, hybrid OAT additive package, low in silicates and phosphates.
• Color: Usually purple (sometimes appears pink/purple depending on concentration and lighting).
• Protection: Excellent corrosion protection for aluminum, magnesium alloys, and mixed-metal systems; resistant to high-temperature deposits common in turbocharged engines.
• Service life: Long-life formula; change interval is typically 5 years or as specified in the Audi service schedule.
• Applications: Common in Audi models from roughly the early/mid‑2010s through late‑2010s and beyond, depending on model and market.

Because G13 is backward compatible with earlier G12+/G12++ coolants, Audi dealers often supply G13 as the standard replacement where the manual allows, simplifying service across mixed fleets.

G12evo: The Latest-Generation Audi Coolant

G12evo is Volkswagen Group’s newer coolant, increasingly found as factory fill on late-model Audi vehicles and intended to support the latest engine technologies and emissions requirements.

Important aspects of G12evo include:

• Standard: Meets VW TL 774-L, the newest specification in the family.
• Color: Typically pink or pink‑violet; appearance can vary but is distinct from bright green or blue aftermarket coolants.
• Compatibility: Designed as a long-term replacement for G13 and G12++ in many applications, but Audi still expects owners to follow the label and manual for mix compatibility.
• Performance: Optimized for high thermal loads, smaller and more complex cooling circuits, integrated battery/cabin/drive system cooling in electrified vehicles, and longer drain intervals.
• Environmental profile: Continues the trend toward reduced environmental impact by improving stability and efficiency, which can indirectly lower energy and resource use.

For many late‑2020s Audi models, G12evo is the reference coolant, although manuals will still phrase it as “coolant that meets VW TL 774-L” rather than relying solely on the trade name.

How to Identify the Correct Coolant for Your Audi

Audi emphasizes that the correct coolant is defined not by color alone, but by the VW/Audi specification printed on the container and in the owner’s manual. With numerous aftermarket coolants mimicking OEM colors, relying solely on visual cues can be risky.

Where to Find the Specification

The most reliable method is to cross‑check your car’s documentation and labeling with what you buy.

• Owner’s manual / service booklet: Typically states a phrase like “Use only coolant that conforms to VW TL 774-G (G12++) or VW TL 774-J (G13)” or similar.
• Expansion tank cap or sticker: Many Audis display a label indicating “Use only G12/G13” or similar wording.
• Dealer or OEM parts catalog: Audi service departments can look up your VIN and specify the exact coolant part number recommended for your vehicle and region.
• Coolant container: Look for explicit mention of the VW TL 774 standard (e.g., VW TL 774-J, VW TL 774-L) and confirmation that it is suitable for VW/Audi vehicles.

By matching the VW TL 774 code from your manual with the code on the coolant bottle, you avoid guesswork and color‑based mistakes that could damage the cooling system.

Mixing Audi Coolants: What Is and Isn’t Allowed

One of the most critical aspects of Audi coolant maintenance is avoiding harmful mixtures. Although some generations are stated to be “mixable,” Audi still prefers that coolant systems are kept consistent with one approved type whenever possible.

Compatibility Rules and Risks

General guidelines apply to most modern Audi vehicles, though the manual and dealer instructions always take precedence.

• Do not mix with generic green/blue IAT coolants: Traditional “green” coolant (often used in older domestic or Asian vehicles) can be chemically incompatible, leading to sludge, gel formation, or corrosion.
• G12 with G11 issues: Historically, mixing early G12 (OAT) with G11 (silicate-based) was known to cause brown deposits and system blockages; this is still warned against in many Audi/VW technical bulletins.
• G12+, G12++, G13, G12evo intermixing: These are generally more compatible with each other than earlier generations, but best practice is to top up with the same generation the car already uses or fully flush and refill with the newer, approved coolant.
• Color is not a guarantee: Multiple manufacturers sell pink or purple coolant; only products that explicitly state VW TL 774 compliance (with the correct suffix) are considered suitable.
• When in doubt, flush: If the car’s history is unknown or contaminated mixtures are suspected, a full coolant system flush with distilled/demineralized water and refilling exclusively with the correct Audi coolant is the safest approach.

Following these compatibility rules significantly reduces the risk of internal corrosion, clogged heater cores, and overheating caused by incorrect coolant chemistry.

Concentrate vs. Premixed Coolant and Correct Dilution

Audi coolant is sold both as concentrate and as premixed solution, and the right dilution is crucial for optimum freeze and boil protection, especially in climates with extreme temperatures.

Recommended Mixing Ratios

While Audi’s exact recommendation can vary with market and climate, typical ratios fall within a standard range.

• 50:50 mix (coolant : demineralized water): The most common recommendation, providing freeze protection to around −35 °C (−31 °F) and sufficient boil protection and corrosion control.
• Max 60:40 mix: In very cold climates, some guidelines allow up to 60% coolant and 40% water, but going beyond this can actually reduce cooling performance and is generally not advised.
• Demineralized or distilled water only: Tap water with high mineral content can cause scale and deposits, which reduce heat transfer and damage components.
• Premixed (ready-mix) coolant: Sold at the correct dilution from the factory, reducing the risk of improper mixing, especially for DIY top‑ups.

Adhering strictly to these ratios and using low‑mineral water helps maintain Audi’s designed thermal margins and extends the life of water pumps, radiators, and heater cores.

Coolant in Audi Hybrids and EVs

Modern Audi hybrids and electric models (such as various e‑tron and Q4 e‑tron variants) use coolant not only for the electric motor and power electronics, but also for high‑voltage batteries and sometimes integrated heat‑pump systems. That makes coolant specification even more critical.

Special Considerations for Electrified Models

In these vehicles, incorrect coolant can jeopardize both performance and high-voltage safety.

• Battery thermal management: High‑voltage batteries depend on stable coolant properties to keep cell temperatures within a narrow band, preventing accelerated degradation.
• Electrical insulation: The coolant’s chemical stability and compatibility with seals and housings are vital to prevent leaks and potential conductive paths in high-voltage environments.
• Integrated circuits: Some models combine cabin heating/cooling, battery cooling and drive unit cooling; contamination in one part of the system can spread and affect the entire network.
• Dealer-only service recommended: Audi strongly encourages coolant service for EV and PHEV thermal systems to be done at authorized workshops due to bleeding procedures, special tools and safety protocols.

Because of these added complexities, using the exact coolant type listed for your specific hybrid or EV Audi model—and having the system serviced correctly—is essential to preserve both warranty and long-term reliability.

Aftermarket Coolant vs. Genuine Audi Coolant

Owners often ask whether they must buy coolant labeled “Audi” or “Volkswagen” or if correctly specified aftermarket products are acceptable. Audi’s official line is to use genuine or approved equivalent fluids that unambiguously meet VW TL 774 requirements.

Choosing a Safe Aftermarket Coolant

If you cannot source genuine Audi coolant, a properly certified alternative can be used, provided it meets every requirement.

• Look for VW TL 774 compliance by code: The label should state, for example, “Complies with VW TL 774-J (G13)” or “Meets VW TL 774-L.” Vague phrases like “for use in VW/Audi” without the standard code are not sufficient.
• Check manufacturer data sheets: Serious coolant brands publish technical data sheets with explicit OEM approvals and laboratory test results.
• Avoid universal “all makes, all models” claims: These products can be too generic and may rely on partial compatibility that isn’t acceptable for a modern Audi cooling system.
• Maintain consistency: Once a specific, VW-approved aftermarket coolant is used, keep using the same type for top‑ups to avoid chemical conflicts.

By treating the VW TL 774 code as non‑negotiable and favoring reputable brands with clear documentation, owners can safely use non‑dealer coolant without sacrificing protection.

Practical Maintenance Tips for Audi Coolant Systems

Coolant type is only one piece of the puzzle. Proper maintenance intervals, inspections, and leak checks are equally important to keep an Audi engine performing as designed.

What Owners Should Regularly Check

Routine visual checks can prevent minor coolant issues from turning into major damage.

• Coolant level: Inspect the expansion tank when the engine is cold; the level should be between MIN and MAX marks. Sudden drops can indicate leaks or internal problems.
• Coolant color and clarity: It should remain relatively clear and uniformly pink/purple. Brown, milky, or heavily discolored fluid may signal contamination, rust, oil intrusion, or mixing with incompatible fluid.
• Hoses and connections: Check for dampness, white or pink crusty residue around joints, and swelling or soft spots on hoses.
• Service schedule: Follow the interval specified in your manual (commonly around 5 years, but model-dependent). Do not assume coolant is “lifetime” if the manual says otherwise.

Staying attentive to these basic checks, and addressing any abnormal findings quickly, can significantly reduce the risk of overheating, head gasket failures, and other costly cooling‑system repairs.

Summary

Audi uses specialized long‑life coolants developed under the Volkswagen Group’s VW TL 774 standard, most notably G12++, G13 and the latest G12evo formulations. These are typically pink or purple, silicate‑optimized, organic‑acid‑based coolants engineered specifically for modern aluminum engines, turbochargers, and, in many models, hybrid and EV thermal management systems.

The correct coolant for a given Audi is determined by the exact VW TL 774 specification listed in the owner’s manual and on the coolant container—not simply by color. Owners should avoid mixing incompatible coolants, maintain proper 50:50 dilution with demineralized water (unless otherwise specified), and, where possible, use genuine Audi coolant or an aftermarket product that explicitly meets the same VW TL 774 standard. Proper coolant choice and maintenance are essential to preserving engine performance, preventing corrosion and deposits, and ensuring long-term reliability across the Audi lineup.

What coolant to use for Audi A6?

The correct coolant for an Audi A6 is specific to the model year and engine, but it is most commonly Audi/VW G13, a purple or pinkish-lavender fluid. For newer models, G12 EVO (pink) is also a new option that supersedes G13 and previous specifications like G12 and G12++. Always check your owner’s manual for the precise requirement and do not mix coolants of different types unless explicitly compatible.
 
This video explains how to refill the coolant in an Audi A3, which can also be applied to an Audi A6: 53sHome AutosYouTube · May 29, 2021
Coolant types by model year

• Audi/VW G13 (Purple/Pinkish-Lavender): This is the standard for many modern Audi models, including newer A6s. It’s compatible with aluminum parts and helps prevent corrosion. 
• G12 EVO (Pink): A newer specification that is backward compatible with G13 and other older Audi coolants. It’s a hybrid organic acid technology (HOAT) coolant. 
• G12 and G12++: These are older specifications that were used in previous generations of the Audi A6. It is not recommended to mix these with other coolants, especially newer ones like G40, as it can cause corrosion. 

Important considerations

• Check your owner’s manual: Always consult your specific A6’s owner’s manual to confirm the correct coolant type and specification. 
• Do not mix coolants: Mixing different coolant types can cause chemical reactions that form precipitates and reduce corrosion protection. 
• Color is not always a reliable indicator: While G13 is typically purple/pink, and G12 EVO is pink, the color alone is not enough to guarantee compatibility. Always check the specific rating or specification on the bottle. 
• If in doubt, use G13 or G12 EVO: If you are unsure which coolant to use or if your car is a newer model, either G13 or G12 EVO is a safe choice, especially if you drain and flush the system first. 

What color is Audi antifreeze?

What Kind of Antifreeze Do I Need?

Color	Manufacturers/Compatibility
Yellow	All vehicles
Turquoise	Audi, BMW, and other European manufacturers
Pink or Blue	Audi, Porsche, and other European models
Purple	Stellantis vehicles (Jeep, Chrysler, Dodge)

What brand of coolant does Audi use?

Whether you’re driving a sporty S4, a luxurious Q7, or a cutting-edge e-tron, the right coolant and timely maintenance are key to longevity. At Audi South Atlanta, our factory-trained technicians use genuine G13 coolant and advanced diagnostic tools to keep your cooling system in top shape.

What happens if I put all-purpose coolant in an Audi?

If you use the incorrect coolant in your Audi then lots of issues may arise. Corrosion and water pump damage, seal damage, radiator damage and much more lead to costly repairs.