I also have what seems like recent increase in black fluffy soot. Weather / gas blend related?
something i noticed online.
"... new research out of the University of Toronto's Faculty of Applied Science & Engineering shows that GDI isn't necessarily the greener choice. Although GDI engines emit lower levels of CO2, they emit more black carbon—the climate-warming particle commonly known as soot—and toxic volatile organic compounds, such as benzene and toluene."
https://phys.org/news/2016-07-gasoli...en-choice.html