What Coolant Do I Need for My Audi?

Most modern Audi models require a VW/Audi-approved, silicate-free “G” coolant (typically G12++, G13, or the latest G12evo), colored pink/purple, and it is critical to use only OEM coolant or coolant that explicitly meets VW TL 774 specifications—never generic green coolant or mixed types.

Why Coolant Choice Matters for Your Audi

Coolant in an Audi does much more than prevent freezing. It protects the aluminum engine and cooling system from corrosion, stabilizes operating temperature, and helps avoid expensive repairs to water pumps, radiators, heater cores, and head gaskets. Because Audi engines and cooling systems are engineered around specific chemistry, using the wrong coolant can cause sludge, internal leaks, or premature component failure. Understanding which coolant code your car needs—and how to top it up safely—is essential for any Audi owner.

Understanding Audi Coolant Types (G11, G12, G12+, G12++, G13, G12evo)

Audi, along with Volkswagen, specifies coolants using internal “G” codes rather than generic market names. These codes indicate chemical formulation and compatibility with different materials and generations of vehicles.

The Main VW/Audi Coolant Standards

The following list explains the evolution of VW/Audi coolant types and which are relevant for most drivers today.

• G11 (VW TL 774-C): Older, blue/green coolant used mainly in VW/Audi vehicles from the late 1980s to mid‑1990s. Contains silicates; generally not used in modern Audi models.
• G12 (VW TL 774-D): Early pink/purple OAT (Organic Acid Technology) coolant introduced in the mid‑1990s. Not recommended to be mixed with G11. Now largely superseded by newer formulas.
• G12+ / G12 Plus (VW TL 774-F): Improved OAT coolant with better compatibility; could be mixed with G11 and G12 in emergencies. Pink/lilac in color.
• G12++ / G12 Plus Plus (VW TL 774-G): Hybrid OAT coolant widely used in Audis from mid‑2000s to around the late 2010s. Typically pink or violet; backward compatible with earlier G12/G12+ systems when flushed properly.
• G13 (VW TL 774-J): Successor to G12++, usually purple/pink. Contains glycerin (partly bio-based) and is compatible with G12++ and most earlier Audi applications if used correctly. Standard in many Audi models roughly from 2012 through late 2010s.
• G12evo (VW TL 774-L): Newest generation coolant in many recent VW/Audi models (especially from ~2020 onward). Also pink/violet; optimized for newer engines and high-performance cooling systems. Can usually replace G13/G12++ in modern vehicles per VW/Audi guidance.

Although you will most often encounter G12++, G13, or G12evo in an Audi service context today, older vehicles may still specify G11 or early G12. Identifying the correct spec ensures proper protection and avoids the chemical conflicts that can occur when incompatible coolants are mixed.

How to Find the Correct Coolant for Your Specific Audi

Because Audi uses different coolants across generations and engines, the only truly reliable method is to check your exact model, year and engine code against official documentation or labeling on the vehicle.

Sources of Information on Your Audi

The following points outline where to look to confirm the correct coolant specification for your Audi.

• Owner’s manual: The cooling system or maintenance section typically lists the approved coolant spec (e.g., “Use only coolant conforming to VW TL 774-G (G12++)/774-J (G13)”). Many manuals explicitly warn against using generic “universal” coolants.
• Coolant expansion tank cap: On many models, the cap or nearby decal notes “G12 / G12+ / G12++ only” or a similar message. If it only says “G12/G13,” you’re usually safe with OEM pink/purple coolant labeled G12++, G13, or G12evo.
• Service booklet or dealer invoices: Recent service history often lists the coolant used. Look for part numbers such as G012A8FM1, G013A8JM1, or G12evo equivalents.
• Audi dealer or official parts catalog: With your VIN, dealers and authorized parts counters can look up the exact coolant spec and recommended OE product.
• Under-hood labels and stickers: Some markets require a sticker for the cooling system. It may list “VW TL 774-J” or similar, which corresponds directly to the G-code family.

Using these sources in combination greatly reduces the risk of guessing the wrong coolant. When in doubt, confirming with your VIN at an Audi dealer or trusted VAG specialist is the safest path.

Typical Coolant Types by Audi Model Year (General Guidance)

While individual models may vary, the following timeline helps you understand what coolant family most Audi vehicles from each era tend to require.

• Late 1980s–mid 1990s (e.g., early Audi 80, 100, some first-gen A4): Often specified G11 (VW TL 774-C), a blue/green silicate-based coolant. Many of these systems can be converted to G12++/G13 after a thorough flush, but this should be done following specialist guidance.
• Mid‑1990s–early 2000s (B5 A4, early A6 C5, early TT): Typically G12 or later updated to G12+. The OEM coolant is pink-ish; mixing with old green G11 or conventional coolants is discouraged without a full flush.
• Mid‑2000s–early 2010s (B7/B8 A4, C6 A6, early Q5/Q7, many A3/S3/TT models): Commonly G12++ (VW TL 774-G), pink/violet hybrid OAT. This is the de facto standard for many used Audis on the road today.
• Approx. 2012–late 2010s (later B8/B9 A4, C7 A6/A7, Q3/Q5/Q7, some RS models): Largely G13 (VW TL 774-J), purple/pink and backward compatible with G12++ for most modern engines.
• ~2020 onwards (latest A3, A4, A5, A6, A7, A8, Q3, Q5, Q7, Q8, e-tron and others): Increasingly delivered with G12evo (VW TL 774-L), the newest formulation optimized for current VW Group engines and thermal management systems, including hybrids and EV auxiliaries.

These ranges are approximations and cannot replace a VIN-specific check, but they offer a useful starting point if you are trying to identify what should be in your reservoir now or what a prior owner should have been using.

Colors, Myths, and Misconceptions About Audi Coolant

Many drivers rely on color to identify coolant type, but this is risky. While Audi’s OEM coolants are typically shades of pink, purple, or violet, color is not a standardized indicator across brands.

What the Color Really Tells You

The following list explains how color can guide you—but also why it cannot be your only reference.

• Pink / Violet / Purple: Most OEM Audi coolants (G12, G12+, G12++, G13, G12evo) are in this range. However, aftermarket coolants that visually match the color may not meet VW TL 774 standards.
• Blue / Green: Often associated with older G11 in the VW/Audi world or generic “Asian” coolants in other makes. Not automatically compatible with modern Audi systems.
• Orange / Red: Can indicate OAT coolants used by other manufacturers (e.g., Dex-Cool), which are not necessarily suitable for Audi unless explicitly approved for VW TL 774.
• Brown / Murky / Sludgy: A sign of contamination, corrosion, or mixing incompatible coolants—or even oil intrusion. This always requires inspection and often a complete system flush.

Because dye color is a marketing choice rather than an engineering standard, always rely on the specification (VW TL 774 code) and OEM labels instead of color alone when maintaining your Audi.

OEM Audi Coolant vs. Aftermarket “Universal” Options

Owners frequently ask whether they must buy coolant from an Audi dealer or if reputable aftermarket brands are acceptable. The answer hinges on compliance with the correct VW specification.

Choosing a Safe Product

The following points outline how to select a compatible coolant if you don’t want to buy it directly from Audi.

• OEM/Dealer coolant: Sold under Audi/VW branding, often in 1.5L or 1L concentrated bottles. Part numbers vary by region (e.g., G012A8FM1, G013A8JM1, or current G12evo equivalents). Using these eliminates compatibility guesswork.
• Aftermarket coolant approved to VW TL 774: Several major chemical brands offer coolants that clearly state “Meets VW TL 774-G/J/L” or “Approved for VW/Audi G12++/G13/G12evo.” Always look for a specific VW TL 774 letter code on the label.
• Avoid generic “universal” coolant without VW approval: Products marketed as suitable for “all makes, all models” but lacking explicit VW TL 774 approval risk chemical incompatibility and corrosion problems.
• Check for silicate content: Most modern Audi engines require silicate-free or low-silicate hybrid formulas. Traditional green coolants often contain higher silicate levels that can damage water pumps and clog fine coolant passages.
• Beware of mixing different technologies: Mixing OAT, HOAT, and conventional IAT coolants can cause gel formation or reduced corrosion protection, leading to overheating and expensive repairs.

Sticking to OEM or to a known-brand coolant that explicitly meets the same VW TL 774 standard as the factory fill is the simplest way to protect both your engine and warranty coverage.

Can You Mix Coolants in an Audi?

While some G-series coolants are technically cross-compatible, Audi’s own documentation is conservative: mixing different coolant types is discouraged except as an emergency measure, and then only when they share the same VW TL 774 family.

Mixing Rules and Best Practices

The points below clarify what is and is not acceptable when combining coolants in an Audi system.

• Same-spec mixing (e.g., G12++ with G12++, or G13 with G13): Safe and expected. OEM concentrate and pre-mix versions of the same spec can be mixed freely if you keep the water ratio correct.
• Modern cross-compatibility (e.g., G12++ and G13, or many cases G13 and G12evo): Generally considered compatible in VW guidance, but ideally you should stick with a single spec after any major coolant service or flush.
• Do not mix modern G12/G13 with unknown green or generic coolant: This risks sludge, reduced corrosion protection, and deposit buildup. If this has happened, a full flush is recommended.
• Emergency top-up with distilled water only: If you are low on coolant and must drive, topping with distilled or demineralized water is safer than adding an unknown coolant. Then, the system should be corrected as soon as possible.
• Full system flush when changing coolant families: If you decide to transition from, say, remains of an old G12 to G12++, G13, or G12evo, the correct procedure is to drain, flush with clean water (sometimes multiple times), and refill with the new coolant mixture.

In essence, minor mixing within the same VW TL 774 family is usually tolerable, but deliberate long-term mixing of different coolant technologies is not recommended if you want maximum reliability and longevity from your Audi’s cooling system.

Correct Coolant Mixture and Maintenance Intervals

Beyond choosing the proper spec, maintaining the correct water-to-concentrate ratio and service intervals is vital for freeze protection and corrosion control in your Audi.

Recommended Mixture Ratios

The following guidelines summarize the standard mixing practices for most climates.

• Typical mix: 50% coolant concentrate / 50% distilled water: Provides freeze protection to approximately −35 °C (−31 °F) and boiling protection well above normal operating temperatures.
• Cold climate mix: up to 60% coolant / 40% distilled water: Improves freeze protection slightly (to roughly −40 °C/−40 °F), but going beyond 60% concentrate can actually reduce cooling performance.
• Warm climate mix: around 40% coolant / 60% distilled water: Sometimes acceptable where freezing is not a concern, but Audi typically still recommends close to 50/50 for balanced corrosion and cavitation protection.
• Always use distilled or demineralized water: Tap water introduces minerals that can cause scale deposits, reducing cooling efficiency and potentially clogging small passages.

Adhering to these ratios ensures that your coolant can perform its dual role—temperature control and corrosion prevention—across a wide range of operating conditions.

How Often to Replace Audi Coolant

Official intervals vary by model and region, but modern Audi coolant is not truly “lifetime” despite some long-life claims.

• Early models (G11/G12 era): Often recommended coolant changes at around 3–4 years or 60,000 km (approx. 40,000 miles). Check your specific manual.
• G12++ / G13 / G12evo vehicles: Commonly described as having “long-life” or “fill for life” coolant. In practice, many independent specialists advise replacement roughly every 5–8 years or 100,000–150,000 km for optimal corrosion protection.
• Heavy use or harsh conditions: Cars driven in extreme temperatures, heavy towing, track use, or with known contamination issues may warrant shorter intervals.
• Any evidence of contamination: Brown sludge, rust particles, oil in coolant, or repeated low coolant warnings are reasons to inspect and likely perform a full flush irrespective of mileage or age.

Regular coolant inspections—looking at color, clarity, and level—combined with periodic full replacement, can prevent many of the slow-developing issues that lead to expensive cooling-system repairs.

Practical Steps for Topping Up Coolant in Your Audi

If your coolant level is slightly low, topping up is usually straightforward, but it must be done carefully to avoid burns or contamination.

Safe Top-Up Procedure

The steps below outline a typical, cautious approach suitable for most modern Audis; always cross-check with your manual for model-specific details.

1. Let the engine cool fully: The cooling system is pressurized when hot. Opening the cap too soon can cause hot coolant and steam to escape and cause burns.
2. Locate the expansion tank: Typically a translucent plastic reservoir with a screw cap, often labeled with the Audi four rings and a G12/G13 marking.
3. Check the “MIN” and “MAX” lines: The coolant level when cold should be between these marks. A slightly low level may be due to normal evaporation over long periods; frequent drops suggest a leak.
4. Prepare the correct mixture: Use the same spec coolant already in the system, ideally as a pre-mix of 50% coolant and 50% distilled water unless you’re adjusting the ratio for climate.
5. Open the cap slowly: If there is still residual pressure, let it bleed off gradually before fully removing the cap.
6. Top up to just below “MAX”: Do not overfill; leave room for expansion when the engine warms up.
7. Reinstall the cap securely: Ensure the cap is tightened to avoid leaks and to maintain system pressure.
8. Start and warm the engine: Let it come up to operating temperature while monitoring for leaks. Re-check level once the engine cools again and adjust if necessary.

By following these steps, you can keep your coolant at the correct level without introducing air, contaminants, or excessive pressure into the cooling system.

When to Seek Professional Help

While minor top-ups are within reach for most owners, some coolant issues demand professional equipment and expertise.

Red Flags That Need a Workshop Visit

The following warning signs suggest a more serious problem that should be evaluated by an Audi dealer or qualified independent specialist.

• Repeated low coolant warnings: A persistent drop in level usually means a leak—anything from a cracked expansion tank to a failing water pump or a leaking radiator.
• Sweet smell, white residue, or colored stains: These around hoses, the radiator, or inside the cabin (heater core) point to external or internal leaks.
• Overheating or temperature fluctuations: Rapid climbs in the temperature gauge or dash warning messages may indicate a failing thermostat, water pump, airlock, or obstruction.
• Milky oil or oily coolant: Indicates possible head-gasket failure or oil cooler issues—serious problems that need immediate attention.
• Brown, rusty, or sludgy coolant: Suggests heavy corrosion or coolant mixing and usually calls for a full flush, chemical cleaning, and sometimes component replacement.

Addressing these symptoms early typically costs far less than repairing a severely overheated engine or a neglected corroded cooling system.

Summary: Choosing the Right Coolant for Your Audi

For most modern Audi models, the correct coolant is an OEM or VW-approved pink/purple G-series coolant—usually G12++, G13, or the current G12evo—meeting the specific VW TL 774 standard listed in your manual, on the expansion tank, or in dealer records. Avoid generic green or “universal” coolants unless they explicitly state compatibility with your VW TL 774 code, and never rely on color alone to judge suitability. Maintain a 50/50 mix with distilled water, check levels periodically, and flush the system at sensible intervals or whenever contamination is suspected. When in doubt, confirm your exact requirement using your VIN with an Audi dealer or trusted VAG specialist; that small step can prevent major cooling-system and engine damage over the life of your car.

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 coolant to use in Audi A4?

The correct coolant for an Audi A4 depends on the model year, but generally requires an Audi/VW G13 (lilac/purple), or older versions like G12++ or G12+, depending on the specific model. Newer models use G13, while older ones might use G12+ or G12++. Always use a coolant approved for Audi/VW to prevent damage, as store-bought coolants may not meet the required specifications. 
This video explains how to change the coolant in an Audi A4: 51s1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · May 27, 2016
Specific coolant types

• G13 (Lilac/Purple): This is the standard for newer Audi models. It’s a silicate-based coolant that is compatible with aluminum parts and helps regulate engine temperature. 
• G12++ or G12+ (Pink/Purple): These were used in older models and are still approved for some specific applications. 
• Important Note: Do not use standard universal coolants unless they are specifically listed as compatible with your Audi’s specifications, as they may react negatively with the cooling system. 

How to determine the correct type

• Check your owner’s manual: This is the best source of information for your specific vehicle.
• Examine the current coolant color: The color can be a strong indicator (e.g., pink for older G11/G12, purple for G13). 
• Look for the Audi/VW specification: Some aftermarket products, like Prestone Max European vehicles (Violet), may be labeled as compatible. 

Does Audi need special coolant?

But unlike generic vehicles, Audi coolant is different. It’s specially formulated to work with Audi’s aluminum engine components and precision-engineered cooling systems.

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.