Mopar OE fill, 86K, 12 Jeep Rubicon Unlimited

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Decided to get an initial coolant sample done on the wife's Jeep. Mileage wise from Mopar the coolant is still good, but age wise I figured it might be time to change but wanted to have an analysis done first to confirm.
 

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I question the accuracy of these results. The report indicates 66% antifreeze concentration by volume. I seriously doubt FCA would be using this much antifreeze on a factory fill. Usually it is closer to 55% max, not 66.
 
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I question the accuracy of these results. The report indicates 66% antifreeze concentration by volume. I seriously doubt FCA would be using this much antifreeze on a factory fill. Usually it is closer to 55% max, not 66.
My 2014 Patriot came with FCA 's new 10 year/150,000 coolant at 64% coolant as measured with my Reichert refractometer.
 
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My total capacity is 7.2 quarts per the factory service manual. I drained 4 quarts out of the radiator and refilled. My 2014 was actually made in April 2013, approaching 8 years and 100K miles. I advocate the partial drain and fill if you are not changing coolant type. I could have waited another year, but thought now is o.k. since I am only doing a partial replacement. Today's coolants seem to keep the systems so much cleaner than the old high silicate coolants of my youth.
 
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I rechecked my notes and it was actually 62%, not 64%. At about 5 years old the overflow tank was down about 6 ounces. After I had already bought OEM coolant to top up, I learned that I could have just added distilled water and still maintain the 50% concentration. I haven't had any recurring coolant loss problems. When I did a radiator drain and fill, I added less coolant % to get the system down closer to 50%.
 
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