I see only one reason to change an oil filter at 6 months or earlier then the oil and that is if you have a concern that the drain back valve/seal is leaking and this is a problem for your engine. Otherwise, I have come to the personal conclusion that filters are for "catastrophic" events only and trap about nothing in a 7,500 miles cycle. (perhaps why Frams have worked so well for so many people over the years, crap fitlers but filters make no difference) In fact, on my one car I go 12,000 between changes and used to changed the fitler at 6000 I am going to try the same filter for the full 12,000 miles. I will be willing to bet the oil analysis will be the same as previous ones in terms of wear and when I cut that filter open there will be nothing noticeable in it.