Fully synthetic, its not the oil, every body gets oil in the pipe work hence the catch tank, the gunk is due to moisture from the air mixing with the oil vapour.
 
might have to do this next i think, looking at post 72, looks very simple to connect this way, hows this different to tonys and phils descriptions?
 
gota get mine fitted soon

SatJan16151505GMT2010.jpg

SatJan16151510GMT2010.jpg




I too have a little spot for it to sit where the oe airbox was
 
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I didnt have any gunk whatsoever in my PCV system after 4 years of driving...