JCL is right! I also get this "cheese whiz" every winter but luckily, I garage my X5 so it never gets a chance to freeze up in the oil separator and has never been a problem. Once spring and summer arrives, the condensate burns off and the "whiz" is completely gone. Since we're nearly half-way out of Winter and the sub-freezing temperatures have subsided in most parts of the country, don't spend the money replacing the oil separator - try doing an early oil change instead to clear some of the condensate out so that it doesn't freeze if we get another big chill before winter is over!

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2022 X6///M - Toronto Red, Silverstone Full Merino Leather, Executive Package w/Remote Engine Start, Soft-close doors, Heated & Cooled Cupholders, Front Ventilated Seats, Front & Rear Heated Seats, Front Massaging Seats, Carbon Fiber Trim.

2002 X5 3.0i, Sport Premium, Titanium Silver, Grey Dakota, Cold Weather Pkg, Xenons, DICE, LED Tails, just a winter vehicle...

2007 550i, Sport Premium, Silver Grey Metallic, Grey Dakota, Nav, Cold Weather Pkg, Comfort Access, HD Radio, Xenons.