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On my 190e, my heater core started leaking, after extensive research, I tried a stop leak (available from Shucks, don't remember the name of it, clear bottle, silver metallic stuff inside). I followed the instructions and it stopped my heater core leak, after a couple of days, flushed the readiator to get rid of the excess. I had the car for an additional 2 years before I sold it, never once did it leak again.
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