LS4 Performance - Brake Fluid Change

I was thinking about doing a flush on the brake system. I was wondering what DOT fluid I have to use. Is DOT 4 ok or what should it be?

Dot 4 is more than adequete

Dot 3 should have been standard. Dot 4 will be an upgrade higher boiling point.

Dot 5 should never be used in a car with ABS

Dot 5 should not be used on pretty much any car. As it is desgined for motorcycles and uses silicone as opposed to glycol.
Dot 5.1 is compatible with cars. As it is glycol.

Ok it sounds good, thanks for the info

The owners manual states:

"Delco® Supreme 11 Brake Fluid or equivalent DOT-3 brake fluid".

Hope this helps.