Little oil in cac pipe what would cause this

Likely leaking in @ the turbo. I'd replace it when it's at the shop, when it's JUST a turbo.

 

Check the air filter first.

 

This is fairly typical with older engines that do idle a lot. The seals aren't perfect in the center section of the turbo and it is bypassing a bit of oil. Pressures on the exhaust side are consistently higher while there is a slight vacuum on the intake side. Oil will eventually migrate through and leak. Usually under load there is boost pressure against the center section seals that keep the oil out and the piping clean. Blue smoke is just oil carry-over and general slobber from excessive idling and lower combustion temps.

 

Also check for a restriction on the oil return. Saw one with a hose almost totally closed on the inside while the outside looked fine. That was an NTC and I thank the M has steel tubing. Like they said probably the turbo. Both of the things I mentioned were found after the turbo was replaced.

 

I should have mentioned too that you should take the intake off at the turbo and check the shaft for any excessive radial or axial play. Have a good look at the ends and tips of the blades to see if they have been scraping the housing.