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Diving Deep into Toyota's Eco-Friendly Coolant

Unveiling Toyota's eco-friendly coolant. Where sustainability meets engine protection. Explore each ingredient role in peak performance.


Toyota's commitment to a sustainable future is reflected in its advanced hybrids and EVs and in the minute details of its engine design and maintenance products. One such example is the engine coolant. With the environment and engine longevity in mind, Toyota has carefully chosen the chemicals in its coolant. Let's take a closer look at the composition:

Super long life coolantEthylene Glycol

Ethylene Glycol is the primary component in Toyota's coolant and is responsible for its antifreeze properties. Ethylene glycol ensures that the coolant doesn't freeze in cold conditions, which can lead to engine damage. Moreover, it raises the coolant's boiling point, ensuring it doesn't evaporate under high temperatures. Ethylene Glycol helps maintain the engine's operational temperature range for optimal performance.


Historically used in many coolants as corrosion inhibitors, nitrites can lead to deposit formation in lighter-duty engines like those in passenger cars. Deposits can restrict coolant flow and diminish heat transfer efficiency, potentially causing overheating. By excluding nitrites, Toyota ensures smoother coolant circulation and reduced engine strain.


While acting as corrosion inhibitors, amines tend to degrade faster under high temperatures. Their aggressive nature can be detrimental to specific metals within the engine. Toyota's decision to omit amines ensures the coolant remains stable for extended periods, reducing the need for frequent coolant changes and protecting engine components.


Phosphorous can cause scale and deposit formation, especially in engines with aluminum components. Such deposits can act as insulators, reducing the cooling system's efficiency. By formulating the coolant without phosphorous, Toyota aims to prevent potential engine damage while also ensuring aluminum components' longevity.

Lubricating Agents

These agents safeguard seals, gaskets, and water pumps, a crucial addition to modern coolants. By incorporating specific lubricating agents, Toyota ensures that these integral components remain in peak condition, reducing the likelihood of leaks and guaranteeing efficient coolant circulation.


Toyota's meticulous choice of coolant composition demonstrates a blend of forward-thinking environmental stewardship and a keen understanding of engine mechanics. While their eco-friendly coolant is a testament to automotive innovation, it's essential to remember that regular cooling system servicing remains paramount. Ensuring periodic checks and maintenance will further guarantee engine longevity and optimal performance. After all, even the most advanced coolant needs a well-maintained system to do its job effectively.

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Peter Neilson is an automotive consultant specializing in electric cars and hybrid battery technologies. He holds a Bachelor of Science in Automotive Service Technology from Weber State University. Peter can be reached on Linkedin and you can tweet him at The_hybrid_guy on Twitter. Find his page on Facebook at Certified Auto Consulting. Read more of Peter's stories at Toyota news coverage on Torque News. Search Toyota Prius Torque News for more in-depth Prius coverage from our reporter.