u know theres a guy on the explorer website that changes his oil at like 34kmiles...he said he ran it through the tests and there was little to difference in what he took out to what he put in....now i know that isnt the case i was just saying =)
i like to change the oil every 5k the tracker is at about 3400 right now...(and running perfect i may add with all the crap i just did/fixed lol)