Yes, after tkamiya recommended I search the site on his id for other related topics, I stumbled across the "hot wagon" post as well. I am going to go buy the mercedes coolant from the dealership today and at least start off there with a flush of the pink stuff the shop put in.
Main question, for our weather patterns here where there's maybe 3 months of warm weather (70-90F) and the rest of the year it's 35-55F, what coolant/water ratio should I use? I read some stuff on it, but then people started talking about using distilled water as well and I'm confused as to the correct approach. Is 50/50 just the safe way to go?