Happened to me in February. Cold weather kit means nothing if you are going to do short trips like me. Taking off the oil cap after a short trip to vent the engine seems to prevent the mayo buildup. I also believe that up to a 45 minute drive is required to burn it off if it's cold. As soon as you stop and park it after any trip regardless of distance, the mayo build-up begins again. It's a never ending cycle.......unless you remove the oil cap to vent. This of course is problematic in a blizzard as an example.

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Current BMW's:
2013 E70 X5 xDrive35i Premium (mine)
2014 F25 X3 xDrive28i (hers)
Past BMW's:
2001 E46 325i
2001 E46 330ci
2003 E39 525i
2006 E53 X5 3.0i
2008 E70 X5 3.0i
2014 E84 X1