NEW BRAKES....DOT 5?

My 1994 Chevy 1500 pickup is dot 3 and has been that way since i bought it new. Every 2 years I use my mityvac and power bleed the system until the fluid comes out clean. Only things I ever replaced besides pads and rotors in the 160K miles I put on it in 27 years were rear wheel cylinders, master cylinder, and I added Russell braded brake hoses, just because I wanted something better than OEM. Flushing the system periodically keeps contaminates out of the lines weather you use Dot3 or Dot5