Valve stem seals?

[swansea v6]

My 160,000 mile E36 323i has started to smoke a little when started. The smoke is white with a hint of blue and only occurs if the car has been laid up over night, or around 8-10 hours. There isn't a lot of smoke and the car uses no oil or water??? Could it be the valve stem seals??? Or any other ideas??
Car runs perfect with no lumpy idle or hesitancy

[swansea v6]

Only had the car two months, I changed the plugs then and they were rather sooted, will check again this weekend? There is a def bit of blue smoke in there? But does not do it at any other time?

[swansea v6]

Cheers will try that!!

[swansea v6]

Any tips on cleaning crank breather?? (PCV I guess )