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Southern Nevada desert | All of the above has errors!
Yes dot 3, dot 4 and dot 5.1 are compatible, you just end up with the worst characteristics of both when you mix them, the lower initial boiling point of dot 3 and less desirable moisture boiling point curve on dot 4 as it ages and picks up moisture.
Dot 5 is silicon, incompatible with all others, DO NOT MIX DOT 5!
Simple charts here: https://epicbleedsolutions.com/blogs/faq/whats-the-difference-betwee...
There is also a Dot 4 LV low viscosity (or Dot 4+) for some late model traction control/abs systems.
Edited by Two Hawk 1/8/2021 20:03
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Dot 3 vs, Dot 4 brake fluid
