Quote:
Originally Posted by Jsolo
All brake fluid is synthetic.
Dot 4 has slightly higher wet and dry boiling points. Both are compatible with one another but not dot 5 (albeit dot 5.1 is also compatible with 3 & 4, but not 5).
IMO, at a minimal, dot 4 should be used in any high perf vehicle.
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Wasn't thinking when I typed that lol.
Yes dot 5 is a big no no.
The difference between dot 3 and 4 is negligible for a street or street performance vehicle. Unless you are going to track it, if you have DOT 3 in I wouldn't go run out and change it just because it is DOT 3 (your not going to boil it on the street or spirited driving). Also I believe the viscosity is different between the 2.