Hello, I'm new to the forum and I just bought my caddy which is a 96 eldorado ETC with 151,500 miles. I need to change the coolant and I am getting different advice from several places that I have called. Most places have advised me to put the green coolant in, even if it has dex-cool now. A lot of them have also advised me to have it completely flushed and some people say to drain it. What should I do?!?