some oil change places are not aware that there is a o ring type washer that has to go around the plug before it is put back in. I believe this is your problem. at 100 bucks or more a pop (oil change) plus a couple thou. for a new motor. wonders never cease. There is also some o rings that go on the filter. any one of these can lead to failure. In any case, if you can prove they forgot to do something that caused failure, yes they are responsible for damages. (catch word is prove)