One problem related to crankcase (pcv) has been reported for the 2006 BMW X5. The most recently reported issues are listed below.
Approximately 1 month after having our BMW serviced for an oil change at our local dealer, the "check engine oil level" light illuminated. We immediately called the dealer, and upon them looking at it, it was determined that the crankcase vent valve (oil separator), needs to be replaced, at a cost of $1,300. We have been having this light come on numerous times over the past couple of years, and always call the dealer when it does. Every time we call, they either tell me to top the oil off myself, or we bring it to the dealer for them to top off. Not once did someone mention that this issue could be a problem, and they continued to let us drive even though the engine could have been damaged in doing so. A very quick internet search reveals that this is a very common problem with these vehicles, and BMW's in general, and I think they should be held responsible and the part should be covered. I now have to get this done immediately, due to the fact that the car is burning so much oil daily, around a quart per 1,000 miles. I am reaching out to help get a recall on this issue. If there is any other information I can provide, please do not hesitate to contact me. Thank you.