OIL BREATHER SYSTEM

Parts no.s 11 to 15 on the link below

http://www.realoem.com/bmw/showparts...& hg=11&fg=15


This is a crucial part of the engine that needs to be replaced periodically and is often overlooked and discarded by owners and dealers!
It is overlooked because of its built in location on the cylinder head!Unlike other common Oil Breather systems that have a hose from your Valve Cover to your Air Inlet pipe ,Bmws have a paper filter (oil separator) within a Capsule (breather) that has a channel .allowing filtration of oil back into your air inlet system.
This Filter(oil separator) has a tendency to clog up on higher mileage cars or cars with bad oils!I recommend changing this every 30,000 Kms .
The consequences of this clogging up completely are obvious!You engine cannot breath and it will blow out all the oil through the Dipstick,overheating and imminent engine seizure.
One occasion,one of my clients was lucky!His 3.0D was idling and stopped ,when I noticed loads of oil pouring out underneath the car!I opened the bonnet and the oil Dipstick was blown out and oil pouring out!We replaced the Breather system and car as new again..........