Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 Mazda 6Coolant Type & Capacity
OEM spec from the factory service manual for the Sport, 2.5L Eng VIN 5 variant.
Quick Answer
Coolant Type
See manual
Capacity
7.20 QTS.
6.81 L
Variant
Sport, 2.5L Eng VIN 5
Note: Use FL22 type coolant in vehicles with the inscription "FL22" on the radiator cap itself or the surrounding area. For vehicles without "FL22" inscription use a mixture of demineralized water and ethylene-glycol-based coolant. Do not use solution that contains more than 60% antifreeze. Above -16Deg. C {3.2Deg. F} 65% water/35% coolant. Above -26Deg.C {-15Deg.F} 55% water/45% coolant. Above -40 Deg. C {-40Deg.F} 45% water/55% coolant.
Source: Factory service manual — 2018 Mazda 6 Sport, 2.5L Eng VIN 5. View full manual section →
What You'll Need
Frequently Asked Questions
- What type of coolant does a 2018 Mazda 6 take?
- The 2018 Mazda 6 uses an OEM-specified coolant. Refer to the factory service manual for the exact type, as it varies by engine variant.
- How much coolant does a 2018 Mazda 6 hold?
- The 2018 Mazda 6 cooling system capacity is 7.20 QTS. (6.81 L).
- Can I use universal coolant in my 2018 Mazda 6?
- Always use coolant that meets the OEM specification for your engine. Universal coolants may not provide adequate corrosion protection.
- What happens if I use the wrong coolant in my 2018 Mazda 6?
- Using coolant that does not meet the OEM specification can cause corrosion, gasket damage, and overheating. Always verify the correct coolant type before topping off or flushing the system.