Quote Originally Posted by tmleadr03 View Post
If Walmart topped off with green you are seeing the result of mixing coolant. Time to clean that out.
My guess is tmleadr is right a 2000 had dex-cool to start with. Take it to a place better then jiffy lube with real mechanics if you are worried about it, they will be more then happy to get more money from you if something is wrong . Streetglideok makes great points about the problems with these engines however i had a 3.8l that that never skipped a beat in 200k miles besides when i changed the antifreeze just like jerrmrc talked about and killed a water pump and a head gasket. A little bit more now may cost you less in the long run if you do not know what you are looking at. If it were me i would get a flush and see if this "oil" in the antifreeze shows up again and if it does stop driving it until you get it repaired.