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Oil in air filter housing?
Having changed spark plugs & fuel filter to try and cure a weird misfire (which I think has worked) I noticed a residue of oil inside my air filter housing. Car has done 135k (1.4 petrol) but has been looked after mostly so shouldn't be too worn I think?

I'm guessing this is coming from the crankcase breather hose? Would this affect emissions come MOT time?

If so what would happen if I left it disconnected, or blocked the pipe it at the air filter end?

Thanks in advance!
I wouldn't worry too much if its only a small amount, as long as the air filter is not affected you will be okay.
If it has not soaked the filter or if there is no great oil consumption then you can ignore it.

Do not block crank case breathers, there is a good chance you would blow out an oil seal.

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