go to
www.partsamerica.com, punch in any of these item numbers, check for store availability, then order online and go pick it up for 95 cents/quart! i just stocked up on Durablend. in store it was like 2.90/quart. the following are all 5w30, but you can search the site for whatever weight you prefer.
Mobil Clean 7500 (synthetic blend): 98HC50
Valvoline Durablend (synthetic blend): 291 (scroll to bottom)
Castrol GTX Start Up (dino): 06226
Havoline (dino): 2195
interesting note on the GTX... apparently Castrol has pulled this oil from the shelves worldwide as of April '07, at least according to one source (
http://www.carbibles.com/additives.html ). maybe these are "clearance" oils, who knows. but you can't beat less than a dollar per quart. you can't buy wal mart brand oil for that cheap.