If you get home fine, did not hear any knocking in the car while driving, did not over heat at all, and just found a trail of oil when you get down of the car, the car will be just fine and did not damage anything at all, maybe the piston ring was wear down a little bit if you run it dry, but since you only find a trail of oil I don't think the engine ever run dry. The mechanic use Syntec oil probably he just want to give you extra for the error made, don't get me wrong Cyntec is a good oil than regular oil, but still as long as the engine don't run dry with oil they both work the same way, only Syntec penetrate more in the cylinder wall.