None of these are something I have any intention of buying, I was more just curious since I have seen it a few times now. I have seen 5, 6 and 7 series all fairly new that were leaving a massive blue smoke screen, does anyone know what might cause that?
Did they have a small 'd' after the number on the trunk?
They are sensation to ccv issues. Could be that
It's more than likely a CCV problem, especially on the M54 engines. The system is ill-conceived all by itself, but add in worn valve seals, poor crankcase sealing at a whole variety of points, and you've got the potential for smoke. All that said, I fixed all of those and still had smoke on mine, which led me down a path that eventually resulted in an unconventional fix that works, based on a supposition that ring float under high post-throttle vacuum was to blame. I have a massive thread on it on Bimmerforums (General Mechanical Repair subforum).
So, just like that you'll leave us hanging without ever knowing your unconventional fix? 
In reply to WonkoTheSane:
Sounds like ring flutter caused by a "large" differential vacuum pressures and modified the system to balance those pressures out with a vacuum catch can?
They were for sure not diesels, all were gas V8 as far as I know. CCV issues would make sense, I was just surprised to see a car that new smoking that badly.
My dad's 3 series had that issue...it was a problem with the turbo. Mileage was just over 5k when it started. Turbos replaced under warranty.
WonkoTheSane wrote: So, just like that you'll leave us hanging without ever knowing your unconventional fix?
It was a dramatic pause.
The fix is to run a small diameter vacuum line between the intake manifold and the CCV. There are unused ports on both that can be utilized for this purpose. This has the effect of dramatically increasing crankcase vacuum under closed-throttle conditions, which in turn helps to equalize pressure between the cylinders and the crankcase, reducing the tendency to draw oil through the rings under that condition. It is absolutely necessary to ensure that the crankcase is properly sealed for this to work, but if it is, oil consumption will drop to nearly zero (see the Bimmerforums thread for testimonials other than mine).
If it's not out of the exhaust could be a leaky valve cover
Crazy you bring this up. Saw a mint M5 E60 couple of days ago and it was smoking like a old Caddy. I was embarrassed for the guy.
M60/2 has a two part the system At the rear of intake mani has a PCV that is piped back under (M60) or under & throught (M62) the intake to th OSV to front of engine (behind the front engine cover).
M60
M62
Smokey V8s are explained here. The M62s are affects as well
I'm not sure how the N6x V8 are setup . . .
N62 V8 in the 5,6,7 series is notorious for valve seal problems. Warmed up, long idle period (red light) will leave a puff/cloud. Have one, living it, in the teardown stage now. Quite fun. Stick to the magical inline 6 with BMW.
A friend of mine had a turbo let go on her 335 before the first oil change. She called it "the james bond car" until the next time it left her, then she negotiated her way out of the lease.
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