Enter your Current System Volume, Current Concentration, and Desired Concentration into the Coolant Mix Calculator to find exactly how much to drain and replace — see your Volume to Drain, Pure Coolant and Water to add, plus Freeze Protection and Boil Point.
Volume to Drain
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Add Pure Coolant
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Add Water
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Freeze Protection
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Boil Point
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A 50/50 mix (50% coolant, 50% water) is recommended for most climates as it provides freeze protection to about -34°F (-37°C) and optimal heat transfer properties.
Use a coolant tester, refractometer, or hydrometer to measure the specific gravity or freezing point of your coolant mixture. These tools give accurate readings of your current concentration.
No, using more than 70% coolant actually reduces freeze protection and heat transfer efficiency. Pure coolant freezes at a higher temperature than a proper mix.
Automotive coolants contain additives for rubber seals and metal protection, while CNC coolants are designed for machining operations with different viscosity and lubrication properties.
Check your coolant concentration at least twice a year, before summer and winter seasons, or whenever you add coolant to the system.
Use distilled or deionized water when mixing coolant. Tap water contains minerals that can cause scaling and reduce the effectiveness of the coolant system.
The correct mixture prevents freezing in winter, raises the boiling point in summer, prevents corrosion, and ensures optimal heat transfer from your engine.