3rd Generation Optima (2011 - 2015)
I have a 2015 Optima. I am trying my hand at flushing my cooling system and my first attempt is not going as expected. So my coolant system has a capacity of 6.8 L, and I can barely get 3 in before it tops off. I've tried burping the upper radiator hose, putting it on an incline, and even...