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I had DOT 5 in a Corvette. After I got it bled properly, it was great. I had so much trouble getting it bled, I never used it again.
I did purchase an electronic brake fluid tester that shows the percentage of moisture in DOT 3 and 4. I test all of my vehicles annually and it appears that given the conditions under which they are used, the fluid will last at least 20 years before the moisture content will reach the critical level.