All turbos get thin, black, smelly oil, it isn't unique to the KR15. Ask any Juke owner. The problem in this case looks to be a bad choice of hose materials for the KR's two-stage PCV system, which is really very effective at scrubbing out the crank but is letting traces of the "trash" (as it were) creep right through porous rubber and out where you can smell it. As I mentioned earlier, the human nose can detect gasoline or ethanol in vanishingly small quantities, so it doesn't take a whole lot of escaped blowby to make a noticeable stink. Nissan knows what the problem is, but most "common" rubber materials like NBR are somewhat porous to ethanol, and hoses lined with alternatives like Viton aren't off-the-shelf stuff. So we're back to the dang supply chain. I'm sure the fix is coming and my guess is before autumn, but exactly when is anybody's guess.