I recently did an oil change & replaced the PCV. I gave the old one the "rattle test" and it sounded almost as good as the new one but I replaced it anyway.
I just checked the old one and now that it is cooler it does not rattle at all.
So I would recommend you replace the PCV even if it seems to pass the rattle test.
I have been using the FRAM FV384 is there a better one?