I have a 2008 Ford Edge, with roughly 95,000 miles on it. The engine has been riding rough lately and making rattling noise while in drive. Took it to my mechanic and he said that the motor oil burned out and as he checked the stick, there was no oil visible. It took roughly 4 quarts of oil to get it to register on the oil stick. Mechanic said I need a new engine. Has anyone else had this problem? The Check oil light never went on prior to this. My options are to spend $4600 on a used engine, or salvage the car. Any suggestions?