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Hi everyone, I'm right in the middle of re-building the head and replacing the oil pickup seal on a 2010 Insignia and I'm seeing an unusual amount of oil on the bottom half of the engine which could be from an old oil leak but I've also noticed a connection on the oil filter housing which looks like vacuum but I'm not sure. It's got nothing connected to it and I cannot remember at all removing anything from it? Can anyone confirm what this is for, and should it be connected to anything?

Reference picture attached.

Thanks
 

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