Well prior history was not great...when I got the car the coolant was black. I've changed it about 3x and when I drained the coolant this time it came out clean with no other discolorations so I think all the junk has finally been cleaned out. No leaks. I should be OK?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k