[DML] Coolant

I may be in the same boat with the other owner who just posted a queryre his coolant. My car had 3k miles on it when I purchased it fromthe original owner and although I changed other liquids at that time (two yearsago) I did not change the coolant...I had a few drips from the lines and stoppedthem ALL with a little tightening of the clamps and they have not leaked since. I am very aware that it is good to change coolant on cars every year or so, howevever this coolant is a fairly bright blue color. Something I have not seen. My mechanic was going to ask his jobber what it was before adding any to it. Recently I saw info from someone re some new coolant supposedly good for 5 years! Does anyone know for sure about this? I am not sure, but suspect mine is also the original. Like the other owner, I have had no problems....the car runs great and cool even in our 105 degree weather for a week or two during the summer. It has 6k miles on it now. I have added about two quarts of water during this time.