My smoking problem ended immediately after the repairs.

If you are unsure where the smoke is coming from, you can check the intake manifold or CCV hose for oil.

Here's some links.

Oil in CCV hoses after replacing CCV - E46Fanatics

Can I use this (Oil Catch Tank) with the ESS TS ? - Page 10 - E46Fanatics

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2005 X5 4.4i SterlingGrau, Sport Package, DSP
Build 3/12/2005