I know that Dot 5 isn’t compatable. ATE super blue and some other DOT 4 fluids are full synthetic though…
Oh… and this:
ATE® Super Blue (DOT 4) has a dry boiling point of 536F and a wet boiling point of 396F. ATE Super Blue is identical in specification to the ATE TYP 200 brake fluid.
ATE Super Blue is compatible and will mix with most DOT3, DOT4, or DOT 5.1 Fluids.