Before I used about half of a 5 liter na absolute sa radiator. so that will be about 2.5L more or less.

If you have your manual you can try checking there or sa web. Another thing I do is I ask the CASA they are friendly naman regarding that.

Another option para hindi ka na mag dilute use na Prestone 50/50 so you will have the proper proportion. Kasi if you dilute hindi ka rin sure because there are some leftover water inside the system.

HTH