I cant imagine this coming from the coolant/wrong type coolant/mixing coolants. Any deposits in that department will sink! says my physics gut feeling. A crystalized salt is always heavier than water.
This is maybe a side effect/result from someone trying to stop a radiator leak or so?
Looks like poached eggwhite....to keep that urban myth alive....
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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