in the US walmart sells the ford OE semi synth oil for around $2.8/qt. i would definitely check them out as a source for the oil.. and get a OE filter and crush washer from the dealer
DIY would save you around $50 in this situation
EDIT: if you're concerned about the length of the oil change interval get an analysis done at a place like http://www.blackstonelabs.com best (only?) way to tell whether the change interval is appropriate
DIY would save you around $50 in this situation
EDIT: if you're concerned about the length of the oil change interval get an analysis done at a place like http://www.blackstonelabs.com best (only?) way to tell whether the change interval is appropriate