mguy04

I have a 2000 Outback with ~210,000 miles. Today I changed the oil but forgot to add new oil! While idling to check the coolant, the engine suddenly made a loud CLUNK and then stopped. Now, when I try to start it, the engine still turns but doen not even fire; it also makes a new whining sound. My neighbor who works on large trucks thought the hydraulic valve lifters are the problem. Any thoughts on how to get the lifters working again, or other thoughts on the problem? (I have added oil, by the way....)