This is not a new topic but please be patient. I changed the engine coolant on my recently acquired 560SL. I used Prestone as I have always on all of my automobiles. Prestone is "compatible with aluminum engines". I have seen considerable controversey regarding green stuff versus Mercedes orange stuff.

Now I don't want to my question to degrede into open warfare but I would like the truth from one of you experts out there. Is the orange stuff Benz hype or is there really something in it specific to the Benz aluminum alloy used in the engine? It is not a cost issue, it is an availability issue.

I seek the truth, not opinion.

Thank Troopers.