Don't oil vapours condense on the baffles (or stainless steel wool) and then drip to the bottom of the can?
If it's not that, then I'm genuinely baffled
Yes ...... And when FI it's even more important , along with crankcase ventilation .
I bought 2 mishimoto ones . The smaller ones though at £80 + vat each . Lovely well made bit of kit ..... Not sure i need 2 though as I have one fitted and the other side vented back into the charger as per stillens instructions .
Stillen instructions?