Hey guys so it's not mustang related but wanted to see what everyone thought. it's pretty self explanatory but my wife's mother ran her Hummer low on oil to the point where i had to add 4 quarts to it yesterday. (it holds 6) so it was 4 quarts low and the engine sounds awful. It wont stay running at idle and as soon as you take your foot off the gas to keep it running it just quits its like the snap of your fingers. there's no bogging down and then dying. it's like spinning a bicycle tire off the ground and then grabbing the brakes that's how fast it shuts off. I'm pretty sure the engine is done it shakes like hell and has knocking coming from the bottom end.. Kind of a pointless thread i know but she's devastated and i'm trying to see if anything else would cause this. What do you guys think, time for a new engine? By the way its a 2006 Hummer with 120k miles with the I5 motor.