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Depends on which Dot you pick. If 5, got to get all the 3 out. If you choose synthetic 3&4, manufacturer says it mixes with regular 3 and regular 4, so I would just flush the best I could. I want all the 3 I can get out for corrosion issues and higher boiling point.

Dot 3-4 synthetic is not hydroscopic, that is why I use it. I have seen internal corrosion on older well maintained Dot 3 systems, so I avoid regular Dot 3.

Dot 5 is great stuff. Overkill in these applications, as systems were not designed for it. If the system has Dot 5, I would recommend carrying containers of it because, as others said, it is not as readily available. I use Valvoline synthetic Dot 3&4. Other companies probably make it, but that...