What Coolant Does a 2018 Audi Q5 Need?

The 2018 Audi Q5 is designed to use a pink or purple, silicate‑free, phosphate‑free, OAT‑based coolant that meets Audi/VW specification TL 774 J (commonly sold as G13), and it must always be mixed 50/50 with distilled water unless you buy a premixed version. Using generic green coolant or mixing incompatible types can damage the cooling system and void warranty coverage for related repairs.

Understanding the Correct Coolant for a 2018 Audi Q5

The coolant in a 2018 Audi Q5 is not just colored antifreeze; it is a carefully specified fluid that must match Audi’s chemical and performance standards. The vehicle’s aluminum engine, turbocharger, and tightly packaged cooling system rely on the correct coolant type to prevent corrosion, overheating, and internal deposits that can lead to costly failures.

Official Specification: VW TL 774 J (G13)

Audi (under the Volkswagen Group) does not typically list coolant by brand name on the reservoir; instead, it uses an internal specification number. For a 2018 Audi Q5, the correct coolant specification is VW TL 774 J, widely known as “G13” coolant, which superseded many earlier formulations in the VW/Audi family.

This G13 coolant is usually:

• Pink or purple in color.
• Silicate‑free and phosphate‑free to protect aluminum components.
• Based on Organic Acid Technology (OAT) with added glycerin for environmental reasons.
• Designed for long service life and compatibility with modern Audi engines.

Together, these characteristics ensure that the coolant provides long-term corrosion protection and stable cooling performance while being compatible with the alloys and seals used in the 2018 Q5’s engine and cooling system.

Coolant Brands and Product Types That Typically Meet This Spec

While the safest approach is to buy Audi‑branded coolant from a dealer or trusted parts supplier, several products on the market are specifically formulated to meet VW TL 774 J (G13). Always confirm the spec on the label before purchase.

The following list outlines common ways this coolant may be labeled or sold in the market.

• Audi / VW Genuine Coolant (G13) – Dealer‑branded concentrate or premix explicitly marked for VW TL 774 J.
• Aftermarket coolants labeled “G13, VW TL 774 J compatible” – Often from European‑focused brands; labeling will clearly state VW/Audi approval or compliance.
• Some “Euro vehicle” coolants – Only acceptable if the label explicitly lists VW TL 774 J or G13; generic “for European cars” is not sufficient on its own.

By cross‑checking the VW TL 774 J or “G13” designation on the packaging instead of relying on color or generic claims, owners can ensure the fluid truly meets Audi’s technical requirements.

How to Identify the Correct Coolant in Your Vehicle

Owners often first encounter coolant questions when topping off the reservoir or after seeing a low-coolant warning. Verifying that the correct fluid is in the system is essential before adding anything new.

Coolant Color and Labeling

Color is a useful but not definitive indicator. Audi’s G13 coolant is typically pink or purple, and the coolant reservoir tag or cap may indicate “G13.” However, aftermarket products may show slight color variations, and some G12++ or G12evo coolants (later VW specs) can appear very similar.

To avoid confusion, look for these details:

• Label specification: The jug should state “VW TL 774 J” or “G13.”
• Compatible models: The label may list Audi/VW vehicles from specific years.
• Type description: Phrases like “OAT-based,” “silicate-free,” and “phosphate-free” are consistent with Audi’s requirements.

When visual cues and labeling match, you can be confident you are using the appropriate coolant for a 2018 Q5.

Checking the Owner’s Manual and Under-Hood Labels

The owner’s manual and under-hood decals are the primary official references for your specific vehicle configuration. They specify the required coolant spec and sometimes show compatible service fluids.

When verifying coolant requirements, consider these sources in order:

1. Owner’s manual: Look in the “Fluids” or “Technical data” section for coolant specification (VW TL 774 J / G13).
2. Coolant reservoir labeling: The side of the tank or cap may show “G13” or a VW part number for the fluid.
3. Service and warranty booklet: May list approved fluid specifications and replacement intervals.

Using the manual and labels ensures that what you add is consistent with factory guidance rather than relying on assumptions or generic advice.

Mixing Ratio and Water Type

Even when using the correct coolant type, mixing it improperly can compromise performance. Audi specifies a 50/50 mix of coolant concentrate and water, providing freeze and boil protection suitable for most climates.

Recommended Mix for a 2018 Audi Q5

The standard mixing recommendation is a balance between anti‑corrosion protection, freeze protection, and heat transfer efficiency. For a 2018 Audi Q5, Audi typically recommends a 50/50 blend of concentrate and water, though in extremely cold climates a slightly stronger mixture may be allowed.

Key points about mixing include:

• Standard mix: 50% G13 coolant concentrate and 50% distilled or deionized water.
• Extreme cold: Up to about 60% concentrate may be acceptable; higher concentrations reduce cooling efficiency and are not recommended.
• Premixed products: Some coolants are sold pre‑diluted at 50/50; they should be used as‑is and never further diluted.

Following the recommended mixing ratio ensures the Q5’s cooling system has the right balance of freeze protection, boiling resistance, and corrosion control.

Why Distilled or Deionized Water Matters

Tap water contains minerals that can deposit inside the radiator, heater core, and passages, reducing flow and heat transfer. Over time, this can cause overheating and internal corrosion.

When preparing coolant mixture, keep these guidelines in mind:

• Use distilled or deionized water: This minimizes mineral content and scaling inside the cooling system.
• Avoid well water or hard tap water: High mineral content accelerates clogging and corrosion.
• Acceptable alternatives: If distilled water is unavailable in an emergency, use the cleanest, lowest‑mineral bottled water you can find, then plan a proper flush later.

By pairing the correct coolant concentrate with low‑mineral water, you help preserve the Q5’s cooling system and maintain consistent operating temperatures.

Why You Should Not Mix Coolant Types

Mixing incompatible coolant types can cause chemical reactions that reduce corrosion protection, create sludge, or clog small passages in turbocharged engines like the one in the 2018 Q5. Even if the colors look similar, different chemistries do not necessarily play well together.

Risks of Mixing G13 with Other Coolants

Although some coolants are marketed as “universal,” Audi’s system is specifically designed around its OAT‑based formula. Combining different families of coolant can undo the careful balance of additives and corrosion inhibitors.

The following problems can arise from mixing the wrong coolants:

• Sludge formation: Incompatible additives can react and form a gel‑like sludge that impairs circulation.
• Clogged passages: Radiators, heater cores, and small turbo cooling channels are especially vulnerable.
• Accelerated corrosion: Mixed chemistries may cancel out protective layers on aluminum surfaces.
• Sensors and pump damage: Deposits can affect temperature sensors and increase wear on the water pump.

When coolant is contaminated by incompatible types, a full system flush and refill with the correct G13 coolant is typically required to restore proper operation.

What to Do if You Are Unsure What’s in the System

Owners of used vehicles or those without service records may not know what coolant is currently in the Q5. Adding the wrong fluid on top of an unknown mixture is risky; a careful approach can prevent compounding potential problems.

If the current coolant type is uncertain, consider the following steps:

1. Inspect appearance: Look for cloudiness, particulates, or brown sludge in the reservoir—signs of contamination.
2. Check previous service invoices: They may list part numbers or coolant types used.
3. Have a workshop test or inspect it: A professional can examine the fluid and recommend whether a full flush is needed.
4. When in doubt, flush: Draining and flushing the system before refilling with confirmed G13 coolant removes the uncertainty.

This approach costs more upfront but protects the engine and turbocharging components from long‑term cooling system issues.

Service Intervals and Practical Maintenance Tips

Coolant is long‑life in modern Audis, but it is not lifetime. Over years of heat cycles, additives deplete and the fluid slowly loses protective capacity. Following proper service intervals keeps the system reliable.

How Often to Change Coolant in a 2018 Audi Q5

Audi’s specific interval can vary by region and engine variant, but in general the factory fill for G13 is designed for extended use—typically on the order of several years, not every oil change. Owner’s manuals and service schedules provide the exact timing for the Q5’s configuration.

As a general guide, owners should consider:

• Following the official maintenance schedule: Check the booklet or digital service schedule for the recommended coolant change interval.
• Earlier changes in harsh conditions: Frequent towing, extreme heat/cold, or lots of stop‑and‑go driving can justify more frequent replacement.
• Replacing coolant after major cooling system work: Radiator, water pump, or heater core replacements usually require fresh coolant.

Adhering to a regular change interval ensures that corrosion inhibitors stay active and that deposits do not build up over time.

Safe Topping‑Off Practices

Topping off coolant may be necessary due to minor evaporation, previous incomplete bleeding, or very slow leaks. Even then, using the correct coolant and exercising caution with temperature are critical.

Before topping off, keep these considerations in mind:

• Only when engine is cool: Opening the reservoir on a hot engine can expel scalding coolant under pressure.
• Use matching G13 coolant: Add either premixed 50/50 G13 or a properly mixed concentrate to maintain the system’s chemistry.
• Watch the minimum/maximum marks: Fill only to between the “MIN” and “MAX” lines on the reservoir when cold.
• Investigate persistent loss: If the level keeps dropping, have the system inspected for leaks or internal consumption.

With careful topping‑off and prompt attention to any unexplained loss, the Q5’s cooling system can remain stable and leak‑free over the long term.

Summary

The 2018 Audi Q5 requires a VW‑approved, pink or purple OAT‑based coolant that meets VW specification TL 774 J—commonly known as G13—and it should be used in a 50/50 mix with distilled or deionized water unless using a premixed version. Audi’s turbocharged aluminum engines depend on this specific chemistry to protect against corrosion, overheating, and internal deposits. Owners should avoid mixing different coolant types, verify the fluid’s compatibility via the label and owner’s manual, and follow factory maintenance intervals. When in doubt about what is currently in the system, a full flush and refill with confirmed G13 coolant is the safest route to keep the Q5’s cooling system performing as intended.

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 color coolant goes in Audi?

What Kind of Antifreeze Do I Need?

Color	Manufacturers/Compatibility
Green	Most Asian manufacturers, including Hyundai, Kia, Nissan, and Subaru
Orange	Ford Motors, General Motors
Yellow	All vehicles
Turquoise	Audi, BMW, and other European manufacturers

What kind of coolant does an Audi q5 take?

The correct coolant for an Audi Q5 is specifically Audi/VW G13, which is a lilac or pinkish-lavender color. This type of coolant is formulated for Audi’s specific cooling system and aluminum components and should not be substituted with generic coolants. While newer models use G13, some older models may use G12++ or G12+, which are compatible with G13.
 
This video demonstrates how to check the coolant level in an Audi Q5: 1mSanu Motors with CharlieYouTube · May 29, 2023
Coolant type by model

• Newer models: Use G13 coolant, which is a specific lilac or pinkish-lavender fluid. 
• Older models: May use G12++ or G12+ coolant, which are also compatible with G13 and Audi’s cooling system. 

Important considerations

• Use only approved fluids: Do not use standard store-bought coolant, as it may not meet Audi’s specifications and could damage the cooling system. 
• Check for compatible alternatives: Some aftermarket brands offer compatible coolants, such as Prestone Max European Vehicles (Violet) or Pentofrost ++, but ensure they meet the G13 specification. 
• Check the owner’s manual: Always consult your owner’s manual for the most accurate information for your specific vehicle. 

What coolant for 2018 Audi Q5?

The correct coolant for a 2018 Audi Q5 is G13, a specific lilac-colored antifreeze designed for Audi’s aluminum components. You can use either a pre-mixed G13 coolant or a concentrate that you mix with distilled water. Always use the specified Audi/VW coolant type and avoid using generic coolant, as it is specially formulated for the vehicle’s cooling system. 
You can watch this video to learn how to refill the coolant in an Audi: 53sHome AutosYouTube · May 29, 2021
Coolant type and options

• Type: The required coolant is Audi/VW G13, which is a specific lilac-colored antifreeze. 
• Pre-mixed: You can purchase a 50/50 pre-mixed G13 coolant that is ready to use. 
• Concentrate: You can also buy G13 concentrate and mix it with the recommended amount of distilled water yourself. 

Important considerations

• Avoid generic coolant: Do not use generic store-bought coolants, as they may not have the specific properties needed for an Audi’s cooling system and can cause damage. 
• Compatibility: G13 coolant is compatible with all previous colors of Audi/VW coolant. 
• Where to buy: You can find the correct G13 coolant at a dealership or an auto parts store that carries European-specific fluids.