Ok had the X5 for few weeks now

And upon first start up or if it's been left standing for a few hours it lets of
A white/blue cloud of smoke smells like oil

I have previously blanked hose of the vacuum pipe from EGR valve and smoke stopped a little

The vacuum pipe has now been reconnected when
Connecting it I thought I would see whether EGR was gunky

It was clean however there was some
Moisture inside valve but like a drop of oil

With the EGR vacuum pipe connected whenever I give it hard acceleration I leave behind a cloud of
Smoke

My question is what is at fault

- EGR valve
- EGR cooler
- valve stem seals