I have my brake lines done and I am ready to bleed the system. I bought some Prestone synthetic brake fluid but when I got home I noticed that it says DOT 3/4 synthetic brake fluid, not just DOT 3, which is what the manual recommends. After the recent post about mixing brake fluids being a major issue, I want to make sure I get the right thing. From what I can tell online the only difference is boiling point and given the proximity to exhaust, I would assume I am better off with DOT 4, but I trust the people here more than my google research so...

What kind of brake fluid should I get, DOT 3 or DOT 4?