Andy,

Good point! I don't suggest changing it hot, and I also don't suggest draining it overnight.

It's the corrosion problem that makes me change it. In the brake calipers the corrosion is accelerated by heat.

I remember many years ago taking my car to an inspection station and saw an open container of brake fluid. It really irritated me that he left it open. Brake fluid soaks moisture out of the air like a sponge. Then he was putting it in an unsuspecting customers car. And he was supposed to be seeing that your car was safe.

Have agreat day,