Brown muddy and gritty water you say????
I had the same exact problem...this guy is the culprit!
The previous owner put this in the coolant and it did not play well with it. It took about 5 cycles to completely get the grit out. From what I read, it is harmless. Hard to believe with all that grit though.
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Ben
1987 190d 2.5Turbo
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