Sir Dieseldude,
I own an isuzu alterra '07. I had problems with my alternator this morning and as the electrician dismantled the air filter and tubes to view the alternator, i saw some oil in the inner lining of the tubes. There is also some oil residue on the turbo assembly. Maybe is is whats causing thick black smoke whenever i reach above 90km/h or 3,000 rpm. Also sometimes while idling there is minimal black smoke which smells like charcoal (not fowl). With these facts what do you suggest i do? I regularly change oil every 5,000 kms and have my 1 yr old original air filter cleaned. My fuel filter was also replaced by isuzu not more than a year ago. Looking forward for your answer