That's the question I was going to ask. Has anyone pulled apart any Dot 5 systems that had rusty innerds? I only had experience with a few that had no problems, but, they were fairly fresh systems, not with 10+ years of use. I've pulled 100's of Dot3/4 systems apart that had leaks and rust though. I don't see how Dot5 could be worse, but, like I said, who has?