Patrick...was the filter black? There have been several revisions to the Subaru factory oil filters in the last few years. Most applied to the turbo models, but I believe they now have changed all of them to the newer style(slightly smaller) filter. There was also a bad batch that went out a few months ago. There's a thread, I think by Subie Gal, in the service or maintenance forum...somewhere. Might be stickied. Basically, they recalled certain filters for a manufacturing defect taht allowed oil to seep out. If his is one, he can take it to a dealership and have it replaced. She has the numbers of the affected filters on that thread.