Similar checklist for (at least some) Boeing’s: there isn’t a specific oily fumes checklist, there is a catch all “Smoke, Fire or Fumes” checklist which appears to run along the lines described by vilas for the ‘bus in it’s logic - again it’s case of working through various systems (electrics and air supply) to find a cause, so that could involve selectively isolating parts of the bleed air plumbing and possibly shutting down air conditioning “packs”. No shutting down of engines.