DOT-5 fluid anyone?

I'm following Richard Ehrenberg's advice. Read it here:

http://www.moparaction.com/Tech/quest/BINDER_JUICE.html

In a nusthell, he says it's OK to switch over to DOT 5 in a system that previously had DOT 3 or 4.

Regarding the advice from a BMW guy that was posted here. I don't put any faith in that. In the mid 90's, when I still worked in a machine shop we were getting 5 to 7 BMW cylinder heads a week that had blown head gaskets. It was a major design flaw. Not to mention that we had countless other early BMW heads that were cracked. I know this doesn't have anything to do with brakes, but the point that I'm trying to make is that those cars are not all they're cracked up to be and I'm not taking advice from someone who is into them.