do you mean the turbo vent filter ? looks like a clear plastic filter about 2 inches long ? if it is , just use an inline fuel filter !
 
This is it well same thing..
 

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Is it something that needs swapping, mines looking abit greased up ?, what does it do I'm guessing its not what i thought it was like a basic breather or oil separator..
 
don't know if its on the service schedule as I do not have rave on this laptop ! I would just wash it out in petrol if you want !
 
nether do I !! but if you google depression valve you'll soon find out !
if you think about it too long you will get depression !!!!
 
Lol, seems its this? Now I have had oil leaks from the filter and maybe that's the weakest link in the chain think I'll swap it for the sake of a 20note..
The mother in laws 1 series BMW drinks oil as discribed in This link maybe this is the cause or their petrol version of it..

Crankcase Depression Regulator Valve
 

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