crankcasr filter

Hi everyone,
Recently I have changed the crankcase breather filter ( by the looks of it, it was never changed since launch) and after I've put everything together again I realized I have forgotten to put the" O "ring to the filter.Now my question is; Is it that important that I have to go to the whole process to put it on?And what is it there for anyway? Thanks everyone.
carcar

For peace of mind I would put it on. It is there for a reason.

Thanks Freelandie for your reply But I would like a more specific answer to know if there's no harm done if left without for the time being.Finished with a bad back and have to wait until better.cheers
carcar

Yes put it on, without it oil could bypass the filter and enter the intake manifold.

Ok mate thanks, that's good enough for me.I'll do it as soon as I'm better.My back is killing me but I'm hoping for a better tomorrow.
carcar

Was it the BMW vortex one ? If not a bit of a waste of time fitting the loo roll one

Hi DTO, Yes it is the loo roll one.I've got a couple of them,so might aswell use them now. can you show me the bmw ones if not to much bother please.thanks
carcar

The sponge one's are ok if you change them at the 12,000 mile service interval as they clog up .
The BMW vortex oil separator should last forever ?

I got mine from here - Oil Separator E60 520d M47N 11127799367

bmw part No 11127799367