Not so sure myself, check-out page 63: http://www.theicct.org/use-emissions-testing-light-duty-diesel-vehicles-us http://www.theicct.org/use-emissions-testing-

Not so sure myself, check-out page 63: http://www.theicct.org/use-emissions-testing-light-duty-diesel-vehicles-us http://www.theicct.org/use-emissions-testing-light-duty-dies... Car B was a 4cy VW diesel with urea from last year.