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what kunkel said is correct.
federal LAW says DOT 5 brake fluid MUST be to coexist with other brake fluids without causing harm. if it wasn't it wouldn't be able to be sold in the US.

i don't have time to look this up and post it. it has been posted several times in the past.
do a goggle search on moparts to find lots of info on this subject.



This subject comes up all time on boards all over the place. Mr. Kunkle is correct. I am amazed that someone would think you could sell a simple product, that if used wrong, could cause a failure and kill...thousands... world wide. Wikipedia says mixing will cause failure....I don't believe it, the legal implications of that are mind boggling.

As I understand it, it was developed by either (or both) the Military or Post office as they felt the DOT 3 stuff wasn't the best for their equipment, which sits around a lot not being used. Its good stuff, use it.