The Model 3 uses a glycol-based automotive coolant—ethylene glycol with corrosion inhibitors—typically in a 50/50 mix with distilled water. Use only Tesla-approved coolant or an OEM-equivalent to ensure compatibility with the car’s thermal management system.
Overview of the coolant type in the Model 3
The coolant circulated through the Model 3’s battery, motor, and charging system is designed to transfer heat efficiently while protecting aluminum components and seals from corrosion. Tesla specifies a formulation that combines glycol with corrosion inhibitors suitable for automotive cooling loops used in modern EVs.
Key characteristics to look for
When selecting coolant, ensure it matches the OEM specification: glycol-based, phosphate-free, silicate-free inhibitors, and long-life technology. Tesla-approved coolant or products labeled as suitable for Tesla or modern OEM vehicles are recommended to avoid compatibility issues.
- Ethylene glycol–based automotive coolant
- Phosphate-free and silicate-free corrosion inhibitors
- Long-life formulation (OAT or similar technology)
- Tesla-approved or OEM-equivalent compatibility
Using the correct chemistry helps prevent corrosion, leaks, and failures in the battery thermal system.
Maintenance and top-offs
Most Model 3 owners use a pre-mixed 50/50 ethylene glycol coolant from a reputable brand, or the concentrate with the ratio clearly stated on the product. Always follow the product instructions and Tesla’s service manual for bleeding and refilling. Do not mix brands unless the manufacturer permits it.
- Buy pre-mixed 50/50 ethylene glycol coolant or mix concentrate to 50/50 according to the product instructions
- Use coolant that is labeled compatible with Tesla or modern OEM automotive cooling systems
- Bleed air from the system after filling to avoid air pockets
- Inspect for leaks and reseal components if needed
For precise ratio, temperature considerations, and service intervals, consult the Model 3 owner’s manual or a Tesla service technician.
Summary
In short, the Tesla Model 3 requires a glycol-based antifreeze with corrosion inhibitors, typically ethylene glycol, used in a 50/50 mixture with water. Stick to Tesla-approved or OEM-equivalent coolant and follow official maintenance guidelines to protect the battery cooling loop and related components.