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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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