X5 e53 white smoke

[jabstick420]

Just acquired an X5 2006 4.4. First post here. My daily driver is an '83 w123 merc, turbodiesel.

Having the dreaded white smoke and hoping to get some assistance. Been reading a lot about this. It seems that ccv and valve seals are the two most common opinions. I am not yet convinced its the valve seals.

Symptoms:

- no smoke on start-up
- very little smoke at warm idle, barely noticeable if any
- if car is in "P" and the throttle is slammed, a plume of white smoke
- no error codes
- car drives great, lots of power
- if sitting in traffic and give it moderate acceleration, smoke is visible

I've changed the CCV membranes on both sides (bosch), also changed the two insulated hoses (both old style). Is there a way to clean the CCV passages with the membranes off?

also did a Liqui Moly engine flush. Oil change right before and right after flush.
filled with mobil 1.

Haven't tried any fuel treatments yet, but was looking at CRC, seafoam, or liquid moly valve clean

If there is significant build up in the valve covers, could this be the culprit?

Thanks for reading. Hope someone can chime in about this.