What part is this?

BalSingh · 03-27-2025, 01:54 PM

Changed the spark plugs today and noticed that there is some oily residue from this - looks like oil feeder pipe but not sure. Would be good to stop before it all gets caked in gunge….

m5rosco · 03-27-2025, 04:39 PM

That's the positive crankcase ventilation valve (known as PCV valve). Simple to change, a couple of small bolts on the other end, and not that expensive from BMW, about £40something each I think. They are known to fail and weep a bit of oil, and can be the cause of excessive oil consumption sometimes. It would be a good idea to replace them.

BalSingh · 03-28-2025, 02:29 AM

Amazing thanks, I’ll be changing that asap. Probably both sides but this is the worst out of the two.

03-27-2025, 01:54 PM	#1
BalSingh Enlisted Member 22 Rep 41 Posts Drives: E31, F20 and F10 Join Date: Oct 2018 Location: Hampshire, UK iTrader: (0)	What part is this? Changed the spark plugs today and noticed that there is some oily residue from this - looks like oil feeder pipe but not sure. Would be good to stop before it all gets caked in gunge…. Attached Images
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03-27-2025, 04:39 PM	#2
m5rosco First Lieutenant 346 Rep 341 Posts Drives: 2016 F10 M5 Join Date: Jun 2020 Location: UK iTrader: (0)	That's the positive crankcase ventilation valve (known as PCV valve). Simple to change, a couple of small bolts on the other end, and not that expensive from BMW, about £40something each I think. They are known to fail and weep a bit of oil, and can be the cause of excessive oil consumption sometimes. It would be a good idea to replace them.
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03-28-2025, 02:29 AM	#3
BalSingh Enlisted Member 22 Rep 41 Posts Drives: E31, F20 and F10 Join Date: Oct 2018 Location: Hampshire, UK iTrader: (0)	Amazing thanks, I’ll be changing that asap. Probably both sides but this is the worst out of the two.
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