My car (2000 Ford Expedition) started making a knocking sound 2 days ago, I thought it was due to the cold weather but when the oil light flashed on I pulled over knowing I was low on oil. When I checked the dip stick I was completely out of oil and put in nearly 5 quarts of Mobil 1 synthetic. Once I put that in the engine started running more smoothly but it still has that knocking noise when I put it under any strain. Does anyone know what I might have done to the engine, and how I can fix it?
Read more: What's wrong with my engine?
