Originally posted by q45denver
What is the recommended vit. C concentration. Is it as good as Prestone super flush?
100 grams per liter of water.
Be sure to flush and drain several times afterward to remove any trace of the flushing agent.
As for the Prestone stuff, I can't comment, as I don't know what is in it. I've seen people dump all manner of things into rads, including CLR demineralizer, and even muriatic acid pool cleaner! Yikes.
But the critical item is to not use something that might attack either the soldered seals in the system, nor any of the gaskets and hoses. Citric alone is reportedly okay for both, and that's why MB recommends it.