Dry boiling point
Wet boiling point


DOT 3
205°C (401°F)
140°C (284°F)

DOT 4
230°C (446°F)
155°C (311°F)

DOT 5
260°C (500°F)
180°C (356°F)

DOT 5.1
270°C (518°F)
191°C ( 376°F)

DOT 4 only goes to 446°

Manual sez:
Use brake fluid approved to MB331.0, or a DOT 4 brake fluid with: minimum dry boiling point (ERBP) 500°F

That's strange!