Yes you can but you have to make it with an face factory voucher (ffv) . You can get them at the trading post, by buying them from someone, or you can find them in whyville. one ffv makes one part!! prices vary. -HOPE I COULD HELP!!!!
An FFV on a V8 5.3 liter engine simply means it is a flex-fuel vehicle. That means that the engine doesn't just run on one type of fuel. It will run on regular unleaded gasoline or an alcohol (ethanol) gasoline blended fuel in any mixture.