Seems to me a lot of us are encountering similar issues now that it's cold (or at least freezing or below). I, too, have had the stuttering, blinking SES, Suspension Level Inactive, and overall crappy idle or misfire. One other symptom that I have is that the battery is weak from limited usage and there's only just enough cold crank amps to start the X. I've shut the car off, waited a minute, restarted, and let it idle for a few minutes and things improved.

I have a 2004 4.4i with about 37,500 miles. The common theme I'm reading on this forum is the oil separator. I'm afraid to drive again for fear of blowing a gasket or otherwise damaging the engine. Not being able to drive is annoying especially since there's a ton of snow and temps won't reach above freezing for several days if ever.

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2000 Z3 2.3 Steel Gray
2004 X5 4.4i Jet Black