by harmigera on Wed Sep 04, 2019 12:22 pm
My understanding of the Provent filter is that it's a coalescing filter. A coalescing filter forces small oil droplets that are buoyant in the oil vapor from the engine blowby to crash into other droplets and coalesce into larger drops on the filter and eventually become so heavy it drips down the filter and into the collection tube. It really shouldn't matter if the oil vapor is hot or cold, it will still coalesce on the filter.
As Wunsie stated, you want the filter black and wet with oil, that is normal. It took me about 3000km before I started collecting any oil, now it's a steady stream.
As when to replace filter, when there is oil residue appearing on the outside of the filter housing, that's an indication the filter is blocked and vapor being released through the pressure valve.