This post really helped me with this fix:
http://www.e90post.com/forums/showth...=103180&page=2
I can't believe I/we are having this problem with the E90. How crazy is it for gunk to accumulate in the fluid reservoir. I've never had this happen with another car. Is it because the tank is more airtight than others and usually in darkness?
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'12 535i,
'12 X5,
'15 Boxster
RETIRED: '08 650i, '07 530i, '06 330i, '00 323ciC