Hi, I am about to pick up a 09X70 3.0 SD and am giving it a thorough service. I also own a E61 535d Msport and I am aware they suffered from blocked Crankcase breathers and a newly designed unit was developed to resolve this issue. I notice the Crankcase Breather on this 3.0 X5 engine is totally different from the unit on my older 535d E61. Can I ask if they need replacing as part of routine servicing, or do they require any form of cleaning/maintenance?

Kind regards

Stu