Not going to lie to you, there IS a chance that you ruined the engine... BUT if the engine didnt sieze on you, then it might be alright... But, I wouldnt ever skimp out on something that important, even if that damn oil change place screwed up the drain plug, I would have just shurgged it off and found an oil pan from a scraped CSVT and replaced it... It sucks to hear about how someone screwed you like that though. If the engine is fryed though... You could always upgrade to a 3L