3rd Generation Optima (2011 - 2015)
Hi,
I've got a '14 Optima EX with just over 104,000 miles on it. It stil has the original coolant in it. I thought I had read that the coolant was good up to 100,000 miles. Do I need to do a coolant flush or is the original coolant still okay? Is there something other than a flush that would be...