Since this thread - http://www.fiestastforum.com/forum/threads/13506-Exhaust-Soot - was closed I'll make a new one to post up how the soot issue was solved.
Don't run a non-synthetic oil or even a synthetic blend!!! ALWAYS run a FULL synthetic oil in this car!!
After one oil change the car exhibited MUCH less soot and it was obvious that for whatever reason, the supplied oil from Ford was not suitable!
For reference, Amsoil Signature Series 5W-20 was used.
Don't run a non-synthetic oil or even a synthetic blend!!! ALWAYS run a FULL synthetic oil in this car!!
After one oil change the car exhibited MUCH less soot and it was obvious that for whatever reason, the supplied oil from Ford was not suitable!
For reference, Amsoil Signature Series 5W-20 was used.