06 2L Z4 Blue Smoke issue

[herbialfa]

Its a 06 2L with 87k on the clock. Absloutely no smoke on start up only when I get to temperature. Then normally in 2nd gear the smoke appears. I'm using 1L (5w/30 fully synthetic) whenever the car asks. I have a small oil leak about 1ft in from the drivers wheel which I noticed after a recent weeks holiday. In a week it left a stain about the size of a saucer on the drive so other than getting that looked at my question(s) are................................

1. I have had the CCV replaced and this helped towards the cause.
2. I had a compression carried out yesterday and all 4 cylinders were near enough bang on the money.

Now my mechanic friend - who ain't charging me thus far - by the power of deduction is thinking now it might be an issue with the breathing system or lack of it forcing the air back i.e. a blocked pipe leading to the CCV or a pipe with very little air flow due to a build up of crud. I'm certainly no guru on engines and how they work but I can understand his reasons and implies this may be another simple easy/ cheap fix to see if that alleviates the problem.

Please note the car runs like a dream.

So what do you guys reckon, would this be a logical step to take? If so is there an online "Haynes" manual that I could maybe print off the neccessary page(s) to give him a heads up?

Thanks in advance

[helix402]

The problem will be due to valve stem oil seals failed.

[Elliot2000]

helix402 said:

The problem will be due to valve stem oil seals failed.

This ^.

It’s worth still checking the breather pipe that goes down to the sump is clear though

[Triumph Man]

Have BMW fired the man responsible for valve stem oil seals? They don't seem to have an amazing track record... Even my girlfriend's R60 Cooper S gives a little puff after being left idling for a while (I know that's originally a Peugeot engine, but still!)