Quote:
Originally Posted by Deserion
I know that Mercedes has a citric acid flush. If the directions are followed exactly, it works well for breaking down gunk. Some forum posters claim it's not as strong as the Prestone flush, for what it's worth.
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For that matter, one could use white vinegar & distilled water as a flush. Probably a 50/50 mix and drive it for a day would do. The stuff in a coolant system is water & acid soluble, shouldn't be any oily or greasy residue.
