I've heard that it's not good to change cold oil (i.e. after the car has been sitting overnight), but, I also know that it takes a little while for the oil to drain to the bottom of the oil pan. Now, draining oil out of a HOT engine is bad news, unless you are wearing a fire resistant suit, or if you just love hot oil all over your hands. So, what would be a good wait time to change the oil? I've heard to wait at least 15 minutes, but even after 45 minutes the engine is still too hot to touch. I don't know about anybody else, but I'm to too keen on getting burned. What would be a good wait time, to allow the max amount of oil to drain to the bottom of the pan, but still be warm enough to flow good. I'm just trying to get as much of the old oil out as possible. I know, there's always gonna be some old oil still in the engine.....