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the breathers job is to stop excessive build up of crankcase pressure in the oil system
which can blow seal & gaskets & PUT STRAIN ON YOUR TURBO
have you ever seen a engine smoke when you unscrew the oil cap this is crankcase pressure
TO STOP THIS
change ur breather every 20k if short journeys & every 30k if long trips mainly its only £19+vat if u have the modded breather which came out in 2005 if u dont u
can change to the new design for £40+vat
part no--modded Breather assembly----- 11127799225 --£40+vat
partno--filter assembly for breatherif have modded style housing------ 11127799366---£19+vat
OLD STYLE HOUSING ON RIGHT
![Image](http://farm2.static.flickr.com/1406/5164982420_7aeb49d43d.jpg)
THIS IS THE OLD STYLE FOAM TYPE BREATHER POOR DESIGN CLOGS EASY
![Image](http://farm2.static.flickr.com/1256/5164377785_84211dc9bf.jpg)
if you can change the air filter you can do this your self it sits next to it
also recommend using Castrol Edge Turbo Diesel 5W40 Oil and changing every 12k or every mot for extended turbo life
i have a couple of x5,s i service with 130k+ still going strong on original turbos & one is mapped
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