Since mine only gets run in summer months, only use water. Hate the sticky feel of coolant if any maintenance needs done. Plus having to get rid of it.
Every fall drain radiator and remove plugs on cylinder case. Then run a few min's jic.
As far as filling/burping , i drilled two 1/8 holes in stat. And also leave cap off till up to temp. Then add to "full when hot" mark.