I have an ERA with their larger radiator. It's filled with 40% anti-freeze and 60% water, with WaterWetter (I normally wouldn't believe in this, but Doug at ERA swears by it and I don't think it hurts). I have an
oil cooler but it is capped off and not in use.
Oil is Brad Penn 30 weight.
Even at 95 degrees ambient, my water stays at about 190 and my
oil at about 185. The only time my water temp rises above that is when I stop the car, and it still never exceeds 200.