I try to buy up the Ford Motor Oil at Wal-Mart. Typically $12 for 5 quart jugs ~$2.30 per individual quart if you buy singles. It's a synthetic blend and you know it's meant to be in your car. They sell Motorcraft filters there too. About $16 for the whole oil change.
2005 GT Premium - Mineral Grey 5-speed MT
Vortech Supercharged - Steeda Billet LCAs, Steeda UCA, UPR adj. Panhard bar, FRPP K-member brace, GT500 Strut Tower Brace, Walbro 255lph Dual pump, FRPP 39# injectors, AIS Water/Meth Injection, Ported Throttle Body. 440rwhp / 406rwtq