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CDNRobb, Technician
Category: Car
Satisfied Customers: 124
Experience:  Licensed Interprovincial technician in Canada. Well versed in Suzuki, Ford, GM.
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what is the mix ratio of propylene glycol and water to produce

Customer Question

what is the mix ratio of propylene glycol and water to produce a minus 20 degree antifreeze
Submitted: 7 years ago.
Category: Car
Expert:  CDNRobb replied 7 years ago.



A 50/50 mix gives us about a -40 C temp reading. If you are looking for -20 F (-28C) a blend of 40% coolant to 60% water should give the blend you are going for.


A 50/50 would be best, XXXXX XXXXX get the slightly better freeze protection. That little extra margin of safety is worth the piece of mind in frigid temps.


Hope that helps

Customer: replied 7 years ago.
the propylene glycol i'm refering to is clear and 99.9% pure fluid used to make up the green or pink fluids that you are discussing
Expert:  CDNRobb replied 7 years ago.

I misunderstood your question.


We don't deal with "pure fluid" here. The only thing I can suggest so you get an accurate reading is to stop by a parts store and pick up an antifreeze tester. For the $5.00 you'll spend at least you'll know where you stand when you start mixing.


I can't give you a mixture offhand that will give you readings you require.