The fact that we have to worry about felony jail time for such benign behavior is outrageous.
It would be outrageous if you really had to worry about it.
You don't, unless you really are trying to use them as silencers as evidenced by the fact that you have the appropriate thread adapter or have a firearm modified to accept an oil filter.
Are you even reading the responses on this thread? It's like you're under the impression that if you say something over and over it's going to become true after awhile.
You do NOT need to worry about owning oil filters and firearms. You DO need to worry about it if you are taking steps to use oil filters as silencers and haven't followed the established procedures for doing so legally.