For those that change their own oil-free 5qt. G-Oil 5W-30 at Walmart after rebate
If your Walmart carries Green Earth Technologies Synthetic Motor Oil (the 34th Street South Walmart carries it as well as the Pinellas Park Walmart too), there is a rebate that you can fill out and get back up to $26 when you purchase a 5qt. of G-Oil 5W-30. Its good on purchases from now thru November 9th. Go here to print your rebate form.