Coolant Mixture

Anyone know what percentage/mix of coolant comes from the factory? Trying to get my truck winterized for interior Alaska. I would assume it's 50/50 since Mopar sells the premix 50/50 as well as the concentrate. I had some test strips as well as the cheapo antifreeze tester and both indicate that it's higher (strips said around 60/40 and other tester well beyond -45F) which I'm skeptical about. Been reading that these tests are probably skewed due to the OAT. Thought about buying a refractometer to test but am also reading elsewhere that it may read higher as well. Guess I can always go to the dealership to get the truck winterized but I have a hard time paying them over $500 for less than $200 worth of parts. Truck already has the factory block heater if that makes any difference for what percentage of glycol comes from the factory. In the end I need it to be around 60/40 to be safe for the winters here.

You need to mix*antifreeze*with water. ... In the*winter, the correctratio*is usually 60%*antifreeze*to 40% water. This mix will protect your engine from everything except the most extreme*winterweather. If you live in a very cold climate, you may want to use a 70%*antifreeze*to 30% water.

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I have always assumed an antifreeze tester was pretty close and when I am changing it myself use one. My mix is 60/40 as I would rather have more protection against the cold than not enough.

How else would they test antifreeze strength for OAT?

grizzstang said:

I have always assumed an antifreeze tester was pretty close and when I am changing it myself use one. My mix is 60/40 as I would rather have more protection against the cold than not enough.

How else would they test antifreeze strength for OAT?

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That's what I'm trying to find out. Read some things from Cummins and elsewhere on the web and it was implied that you need a special tester for OAT which was a pretty penny. Trying not to overthink this but would hate to go over 70/30 when adding concentrate when the truck was already at 60/40 and not needed at all. I just called the dealership and the service advisor said the coolant mixture can vary from the factory. Of course she wasn't sure how they determine that lol. Guess I can always pay them for the winterization and then it's on them.