Best coolant for our 60-70's Mopars?

ArizonaKid said

Wasn't the problem that people would use just straight tap water? i remember reading an article about those aluminum sixes that mentioned that.

But yeah, I just use the green stuff, works just fine.

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Never use straight tap water, it will form mineral deposits.
Always mix antifreeze with distilled water to prevent this.
Open the radiator cap, if you see white particles stuck to the radiator tubes it is mineral deposits.