Hope it is just a pulley. That would be easy. But the CCV is something to think about this time of year. Just happens sometimes. I got hit 2 winters ago. Thought I had blown the engine. Started billowing smoke at the bottom of a highway ramp. It was like -20F (very rare here). Pulled into the nearest parking lot (a brewpub, my guardian angel was watching over me that day) and waited 6 hours for a tow truck.

Things to check before running it - Check your oil level. Look under the oil cap and see if you have "mayo" - a creamy mixture of water and oil - that is a sign water vapor is not getting cleared properly by the CCV. Also remove the intake pipe and push the throttle body open to look inside with a flashlight. There was about a quart of oil inside my intake...

To recover, I removed and cleaned the intake, and replaced the whole kit&caboodle, including the oil separator, CCV valve, the hoses and the metal return oil line running down to the oil pan. There is a retrofittable ccv hose heater available for the M62 4.4 engine as well. My dealer swore it didn't exist, but it does and there is a DIY posted here.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles