I also bought the "DOT 5 is better for old vehicles" thing about 13 years ago when I was "restoring" my 1954 Suburban. I had no problem calling all brake parts manufacturers to confirm DOT 5 compatibility with all rubber parts. The only problem that I had was with a Jim Carter master cylinder that was defective.
I should probably bleed the brake system, but I have not bled it in over 9 years.
Nonetheless, I will not use DOT 5 again. I now see no benefits.
