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In my area, we can still buy concentrate. If you go to a "big box store" like autozone or pep boys etc., they have the premix primarily.. at least up my way.

If the old stuff is red, you'll need to match that color or do a total flush a couple times.

Any of the name brands are good. If you have aluminum parts (such as a intake manifold) make sure...

General rule of thumb is 2 gallons.. We won't know how big your radiator is either. Or if there is a heater.