I don't like it, it does not make the system water proof if water gets in the system and it will over time were that one drop of water sits will rust and ruin the part. I have dealt with some re-builders of brake calipers that state warranty is void if dot 5 is used for this very reason.
I have seen dot 3 and 5 mixed it did not cause a issue I know of. I did the maintenance on the trucks for the local USPS for 30 years till I ran that sorry bunch off dead beats off.... They were outfitted with dot 5 I have seen them mixed with no issues.
Either way you go you could find a shop that has flush equipment and have the system flushed its not money wasted. I have a set up that's decanted to both I don't mix.
If you topped off with a little dot 5 suck it out of the reservoir fill it with dot 5. I don't think the seals in the system care either way dot 3 are 5... The only issue I ever had was the cover seal on the master swell/deform but none with the master cyl calipers are wheel cylinders that were not related to age... YMMV..
Stop buy I will sell you a gal of dot 5 for $50 :D and be happy to shed myself of it I have 6 gal you can have it all...
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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