I live in north california and I go skiing often at tahoe. And often leave the car out overnight. I never change the coolant before so I know the orginal mix ration works?

So is 50/50 the orginal mix. Also like to have the idea of keeping things orginal.

thanks

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Silver Honda Accord, 2006
Silver G500, 2003
Silver SLK-320, 2002
Black ML-320, 2000
Bule Porsche 993 Targa , 1997
Silver Merkur XR4Ti, 1987