I got my oil changed on Friday, drove home and parked my car for the weekend. Drove the two minutes down to the BART(regional heavy rail) which is two miles from my house, and back yesterday. I noticed that it was visibly leaking oil when I got home, and moved the car back 10 feet to verify. When I started it up, it made a slight chattering sound from the engine. I pulled the dip stick and it's dry - nothing at all. I retraced the steps down to bart, and there's a line of oil from my house, to the puddle left in my parking space, and most of the way back up the hill.

I'll call the oil change place today, but I'm not sure how to tell if there's any permanent damage. Should I let the place put fresh oil in and see how it goes? Should I insist on taking it to a different mechanic at their expense? Presumably they'll want to see it first. Is permanent damage to the engine likely? (it's a 2.2L honda engine in a '01 Prelude)