Oily/Damp air intake??

[bryce]

Just taken my air filter out to give it a little clean (its not too bad actually - steeping in the sink just now) and Ive noticed that cylinder 5 and 6 are very damp/oily. 1 2 3 and 4 are perfectly clean. 5 is probably the worst.

Is this a sign of anything? Find it strange that the rest are immaculate.

Pics ...

[dave1]

its just cause there at the back :thumbs:

[SpineOnABap]

Pretty normal I believe. Not checked mine but I've seen other people discuss it (years ago mind!)

[glendog74]

I just looked at mine and it's the same - pretty manky! :smt104

[Mark CSL]

They are all like that there is a small hole just behind the support leg in this pix



It is a breather for the sump so when you clean it dont use any thing but a cloth with carb cleaner on the cloth or it will contaminate the oil

The BMW dealer done mine i went and showed them after i seen mine
It was cleaned free of charge :thumbs:

[1cosmicboy]

Re: Oily/Damp air intake??

Just taken my air filter out to give it a little clean (its not too bad actually - steeping in the sink just now) and Ive noticed that cylinder 5 and 6 are very damp/oily. 1 2 3 and 4 are perfectly clean. 5 is probably the worst.

Is this a sign of anything? Find it strange that the rest are immaculate.

Pics ...

the breather from the cam cover to the airbox causes this ,not a problem,all type of cars breathe this way

[bryce]

Confirmed with dealer yesterday that all is ok. Oil / dampness is drawn up from the breather into the trumpets.

So how do I clean it properly? Particularly the dust in the bottom of airbox.

[SMD]

Use some brake cleaner and a rag!

[glendog74]

I used a trich based fluid, similar to brake cleaner in result but almost odourless and evaporates leaving no residue.

Intake trumpets look sweet now and no sandpit left! :thumbs: