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95 Impreza 1.8 holds 6.2 quarts in cooling system. So if I put in 1 gallon Prestone and the rest water I should be set at about a 70 - 30 mix right ?

 

On my gallon container of Prestone Dexcool, it's written that a mix of 50/50 will keep the mixture from freezing down to -37C° and from boiling up to 129 C°. 70/30 will give you -64 C° and 135 C°. That last proportion seems to be the minimum dilution recommended.

4 quarts is 64 % of 6.2 quarts. I would think that's more than enough. Use demineralized water only. Even for the last flush cause you can't get all the flush water out of the system.

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<<95 Impreza 1.8 holds 6.2 quarts in cooling system. So if I put in 1 gallon Prestone and the rest water I should be set at about a 70 - 30 mix right ?>>

 

the correct way is a 50/50 mixed solution.

 

Depends on where you live. 50/50 mix will freeze up in the interior. 75% is about the mixture that I normally run in my cars. Just go buy a cheap hydrometer and check your mixture to make sure it's where you want it.

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