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Holy Flashback Batman. Water wetter is what we/I used in the e36m3 that saw high heat because of the necessary fan delete mod (another story). I don’t want to make this lengthy, but even with the proper dilution, your t-stat reading will potentially be tricked into staying cold most of the time especially during highway driving and could cause all kinds of false readings. This was ok for an Obd1 s50 motor. The S55 is so far advanced with tech and cooling that it’s almost absolutely not worth the risk imho.
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