[elise/europa]

It is more complex than that, and the DOT 3 or 4 or 5 do not refer to the boiling point.

You can have different DOT3 with completely different boiling point, from 300 F to 660 F.

Do not touch DOT5, the pedal will be spongy, but it is better for the paint if you drop the oil to the paint.

Now, which one, DOT 3 or 4. No big deal, take any of both. It is more a question of chemistery about sealing.

If you are heating the oil by braking hard, go with some cheap DOT3 Ford at 550F. If you race or you are doing track day, DOT3 or 4 with a boiling of 600 is more than enough. And if you are very gentle with the car, just respect the car spec witj usual DOT4 oil spec, without taking care of the boiling point.