Castrol edge is the only one people are using !! Ford should sell you a couple of litres my dealer did . See another dealer , there's heaps more info over @aff on the Miami 5.0 ltr , you will just have to go threw and find the post on engine oil , http://www.fordforums.com.au/forumdisplay.php?f=282&order=desc People are buying it in 20ltr drums , I don't think it's produced in 5ltr bottles yet , but dealer should look after u !!!!