Be a little specific.
I assume it is an X5, is it Diesel or Gas?

Mileage?

What was the most recent repair you've done on the engine?

When was the last time you changed the oil? How often you change it?
Have you changed your spark plugs?
Have you inspected the engine at all?
Have you changed the VCG?

I am not a professional mechanic, but other members will definitely need some details about your car to be able to help you.


Edit:

I would change the thread title to something like "Smoke under valve cover-N52 X5"
General titles don't get much attention.






Sent from my iPhone using Tapatalk