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.
2021 Acura RDXCoolant Type & Capacity
OEM spec from the factory service manual for the Base variant.
Quick Answer
Coolant Type
50/50 mix of HONDA Long-Life Antifreeze/Coolant Type 2 and distilled water
Capacity
1.43 GALS.
5.41 L
Variant
Base
Note: Includes: the coolant in the reserve tank and that remaining in the engine.
Source: Factory service manual — 2021 Acura RDX Base. View full manual section →
What You'll Need
Frequently Asked Questions
- What type of coolant does a 2021 Acura RDX take?
- The 2021 Acura RDX requires 50/50 mix of HONDA Long-Life Antifreeze/Coolant Type 2 and distilled water. The exact spec may vary slightly by engine variant — this page shows the OEM recommendation for the Base configuration.
- How much coolant does a 2021 Acura RDX hold?
- The 2021 Acura RDX cooling system capacity is 1.43 GALS. (5.41 L).
- Can I use universal coolant in my 2021 Acura RDX?
- It is strongly recommended to use coolant that meets the 50/50 mix of HONDA Long-Life Antifreeze/Coolant Type 2 and distilled water specification. Universal coolants may not provide the correct corrosion protection for your engine's materials.
- What happens if I use the wrong coolant in my 2021 Acura RDX?
- 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.