I've been changing oil every 15000 through Ford (its free) and know i'm going to do it myself every 10k(I've only done 30K). What's the best oil to use and is 15k simply a cost cutting exercise by Ford?
The best way to keep your motor in its best condition is to change the oil as much as posible. Every 3 months OR 5000km will keep your motor clean inside and will cause less wear of the moving parts.
The brand of oil doesnt really matter, but the more u pay the better it is.
For the ford motors the best oil to use would be a 20W-50 oil (except for the AU 6 cylinders which need a really thin oil)