I have also found that there is very little information available for the brazilian made ford engines on the net.
You could contact a Ford Commercial Truck dealer by phone, they could help you out.
I have the 6.6 Liter, I"m not sure how different the two engines are. Mine has 2 oil filters, 1 diesel fuel filter, and one engine coolant filter. It costs me just over 100 bucks to replace these filters. I would immigine the two engines use the same oil filters. We can compare numbers, and if you are unable to find them locally, i will ship em to you. There is a shop near my town that has them in stock. I don't want any extra money, just the price of the filters and shipping. The two oil filters are about $12.50 each.
the 6.6 liter holds 22 quarts of oil, the school district that sold my bus to me changed the oil ever 4 thousand miles.
Quis custodiet ipsos custodes (who will watch the watchmen?)