So what's the verdict with Water Wetter? Seems to have great reviews and I would be happy with 10 degree lower temps on my '17. I was hitting 211 with the temp at only 62 outside this week, so I even drilled 1/2" holes in the lower solid portion of the grille and has seemed to help a little, cooling down a bit quicker once moving, of course... This will be my 2nd summer with the car, it has almost 20k now so don't want to flush the coolant just yet, so a 12 oz. bottle should be fine I hope, $10 on Amazon... Also, why are people worrying about oil temps when full synthetic doesn't even begin to lower protection until at least 260? Especially when our coolant temps seem to climb quick and we will hit limp mode at 240...