Last time of the many times I've been in for service, there was a lady there who had brought her car in for an oil leak. The SA came out after they had evaluated it and told her that the shit wasn't put together right and they know they didn't do the oil change because there was a Korean filter in there. Man, he was condescending, but it was pretty funny.
I guess they don't like you doing oil changes with Korean filters. That's the only advice I have. Oh, also make sure they put the car all the way back together.