OK the DOT 5 has not changed it's life style to one of questionable values. But I bought a used 2000 FLSTC and have been doing the maintenance a little at a time since I got her in Sept. Amsoil and filter, Lyndall pads, grease steering neck etc. Tonight I changed the brake fluid in the front reservoir and it looked like the old DOT 3-4 from my previous bikes. This is my first experience with DOT 5. The bottle of DOT 5 silicone fluid looks purple when new and I was wondering what DOT 5 looks like when it's dirty. The bike was serviced by the local HD dealer since new before I bought it and I am hoping the they used DOT 5 if and when they may have changed it. I called the local dealer to verify what the shop manual and owners manual indicated as a DOT 5 system. When I asked what they used the service rep could only answer "that what it says on the reservoir cover is what they use" when I told them they covers were replaced by chrome covers without any label they were at a lost. Am I being to paranoid about mixing DOT 5 w/ DOT 3-4?