2012 Golf Tdi SE 1.6 "breathing"

[Simon]

Hi all. New to this club so hello and thanks for being here. 

We just bought a 2012 VW Golf 1.6 Tdi, 60,000 miles. Lovely car drives well. The guy that services my VW vans had a look at it today, says it's breathing far too much from the oil filler, if you remove it. He reckons it's rings or maybe piston. It certainly does puff well at tickover with the cap partly removed, bit of smoke too. Is he right or do they all do this??? Blocked breather maybe?

Thanks anyway and hello again