I ran a B5HS all summer, WOT and distance trips (1500 some-odd miles) - never had a problem w/it. I just switched to a B6HS and so far have noticed no difference at all.
I ran the B5HS simply because that's what was available at the time, I switched to the new B6HS because the B5HS was becoming lightly corroded on the outside
and it annoyed me to see it
gdang ocean o_O