There is an actual updated cold climate dipstick guide tube which should be installed at the time of cold weather CCV updated parts.

There is a BMW SIB from 2009 that I posted recently with the part number. Not replacing the tube as well at time of cold weather parts install may not yield optimal performance of the oil separator.

I am thinking about opening up my cold weather CCV that I just bought before install to be sure the diaphragm is assembled correct. I also have the cold weather dipstick guide tube to make my CCV replacement complete according to BMW standard

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards