Axsyn AC-9 Coolant Concentrate is a premium organic long-life coolant built on carboxylate technology — no silicates, borates, phosphates, nitrites, nitrates or amines. Suitable for both automotive and heavy duty diesel engines, its double inhibitor package provides serious corrosion protection and extended service life. With 90% monoethylene glycol content, it delivers both anti-boil and anti-freeze protection. Service life of up to 10 years or 1,000,000km in automotive applications. Mix to your required protection level before use.