Parts for your 2015 Audi Q5-Coolant

2015 Audi Q5 coolant — what it does and when to change it

Coolant is absolutely relevant to the 2015 Audi Q5. Audi’s owner information and service literature, along with the VW/Audi TL 774 standard (G12++/G13), specify a pressurised liquid engine coolant for all Q5 engines of this era (TFSI and TDI). That factory-approved coolant is an OAT formulation designed for aluminium engines and mixed with demineralised water. So, yes—the 2015 Q5 is built to run a proper coolant blend, not plain water.

The coolant in a Q5 does much more than stop overheating. It circulates through the block, head, turbo and heater core to carry heat away, protect against internal corrosion, prevent scale build-up, and raise the boiling point while lowering the freezing point. That’s vital for Aussie and Kiwi conditions, where scorching summer runs, steep climbs and heavy towing can all push temperatures up. Using the right spec also keeps water pump seals, alloy galleries and plastic housings happy over the long haul.

• Regulates engine temperature for efficiency and performance
• Guards against corrosion and electrolysis in alloy components
• Lubricates the water pump and seals
• Improves boiling and freezing protection versus plain water

For servicing, the 2015 Q5 should be checked cold at the expansion tank. The correct top-up is VW/Audi G12++ or G13 (usually pink/purple in colour), mixed 50/50 with demineralised water. Don’t mix in generic green coolant or silicated blends—if the history’s unknown, have it flushed and refilled with the right spec. While Audi commonly calls coolant “lifetime” and advises inspection, many reputable workshops in Australia and New Zealand recommend replacing every 5 years or around 150,000 kilometres, or sooner if the coolant tests weak, looks rusty, or major cooling work (water pump/thermostat) has been done. Bleeding air is crucial on refill, run the heater on hot, follow correct bleed points, and ensure the cap is tightened to spec. If the level keeps dropping, look for pink crust around hose joints, a sweet smell, or dried residue at the water pump or radiator—sort leaks early to protect the alloy engine and turbo.

• Check only when cold, the system is pressurised
• Use demineralised water for mixing (never tap water)
• Aim for 50/50 mix, up to 60% concentrate for colder climates
• Test freeze/boil protection and pH during routine services

What coolant type does a 2015 Audi Q5 use?

It’s designed for VW/Audi TL 774-series coolant: G12++ or G13. These OAT coolants are typically pink/purple and are compatible with aluminium engines and modern seals. Always match the specification on the bottle—colour is a guide, not a guarantee.

How often should the coolant be changed?

Audi advises regular inspection and topping with approved coolant. Many AU/NZ workshops recommend a complete change about every 5 years or 150,000 km, or sooner if tests show weak protection, contamination, or after cooling-system repairs.

Can different coolants be mixed?

Only mix coolants that meet the VW/Audi TL 774 G12++/G13 spec. Avoid blending with generic green silicated types. If the existing coolant is unknown, it’s safest to flush and refill with the correct spec using demineralised water.