Dear Ed, I have used the Prestone Flushing Tee on all of my cars since it came out back in the 70's-80's. It works really well. I have not used it on my D. I am interested in how others flush the system as well. Remember that in many places it is illegal to flush the system out and let the coolant run into the sewers and into the ground, so be careful. Happy Motoring, Gary Masie --- In dmcnews@xxxx, "edherrmann" <edherrmann@xxxx> wrote: > What is the best way to flush out the cooling system. Thanks. Ed 10078, 16228