I have noticed a quite a few of these missing from local 3 series cars.....I have also noticed that once and a while mine sits slightly proud after a skooshing.....may take it to the stealer and get it logged at least so that if it EVER disappears I have a record that it was not sitting right. Interesting about the concentration of the washer fluid.....how on earth can we possibly test that we keep ours within tolerance, does the manual give figures thereafter how is it possible to assure the correct concentration? Of course as temps fall the concentration will no doubt change.
Clearly a design flaw and BMW need to fix.
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