Hi...well it is really cold here today, but I just wanted to be sure. I already had pulled out and looked at the little white plastic dipstick in the coolant tank to check the level a couple of weeks ago after I first took delivery, and remember seeing green, as I was curious then if I could use the same coolant as my Optima. But, just to be sure, this time I carefully and slowly pulled the dipstick out and re-examined the color. It definitely still looks green on this dipstick, and it also still looks green through the plastic coolant tank, so I am now totally convinced that the Stinger does take the typical green coolant. It is definitely not blue, or even a sickly yellow....the coolant is green...