That's 500ml or 0.5L, approximately half a quart. Any DOT 4 is okay, I prefer using the high-temp stuff because I'm hard on my brakes. I'm currently using ATE Super Blue, but Castrol SRF, Motul 550 or 600 or many of the others are fine as well- Valvoline Synthetic, Castrol LMA, etc. Taka