I should have mentioned that my X5 is garage kept and the oil is changed at 7500 mile intervals is not driven short distances.

Although I'm hoping my issues are purely the CCV as it was in my E39 the potential cause is baffling. Our temps in the Pacific NW are not so cold that even if it did sit outside that I'd expect sludge build up ever.

jbond007...when you do remove your VC's please post photographs. I'd love to see what is gumming up the inside if anything.

Thanks everyone for your input. I'll let you know if my smoke clears when I replace the CCV's

smoke
 

my 05 does it as well, only after idleing a couple minutes. Dealership checked it out under cpo warranty and said nothing was plugged or clogged, no codes, no problem. Yet they saw how bad it smokes after ideling then reving. They told me it was an engine problem requiring a tear down. I would be responsible to pay if nothing was found broken, cpo doesn't pay for worn parts. Their advice was 'drive it like you stold it'.
Halifax BMW terrible.
Most of the threads on here say the problem was valve seals. Some were fixed under cpo, thats burns hearing that. Halifax bmw sucks imo.

Hate to be the bearer of bad news but the N62 engine is not a 'bulletproof' BMW engine. The VSSeals are a known failure item at low mileage.

To my knowledge, there are no after-market seal kits for the N62.

So this begs the question. Tear down the engine, fix all the other stuff that can go wrong too: Timing chain guides, gaskets, rebuild the heads, coolant pipe!!(another freakishly expensive failure item due to shitty seals and not so great design-from a longevity perspective) and of course the valve seals - If the seals are the same as the original then why bother? Based on my experience they will go again at 45 k miles and I just spent a shit load of money.

Guys the CCV you are talking about, is that this thing?

BMW E53 X5 N62 4.4L > Engine > View All > ES#18560 Pressure Regulator Valve Repair Kit - 11127547058

Julez get yourself some of this "Right Stuff" Gasket Maker

Yup, not sure if this is called the CCV, but in the 4.8is, I really can't find the CCV in the back of the engine. So I replaced this as well for now.

Dealer called me back today and replaced both CCV's and that resolved the smoke at idle problem. He is going to perform more testing before giving it back to me on Monday.

I'm getting visions of the valet in Ferris buelers day off, getting the X airborne....

So after two months of being smoke free it reared its ugly head again. I took the For Sale signs out of it until I get this resolved since I don't feel good about selling a car with a mechanical problem.

The dealer has had my car two days and found the valve cover was the culprit and is replacing it.

I'll keep the car for a couple more months before putting the sign back to ensure the trouble is resolved. Who knows I may end up keeping it since my spouse is nagging me to cancel the order on the new BMW. Trying to smooth things over!

Smoke from start up
 

I too had this exact same problem in my 01 x5 3.0. I wanna say it occured around 80,000 miles give or take 10,000. I wish I could remember what the exact fix was, I want to say something about a regulator...I can't be certain but my mechanic knew right away what the issue was, replaced the parts and it never happened again. I'm at 183,000 and it has not reared its head. I'll try to see if he remembers since it was a few years ago, but i remember it not being too massive of a job. Hopefully i'll get back with a more exact answer