I have recently found the Purolator "PURE ONE" line of filters, the OIL is # PL44872 for our 7.3s they say they are 99.9% efficient, about $16.00 at the chain stores that sell Purolator products.
I just changed my oil with Shell Rotella Synthetic and this filter, I'm planning on 10k miles before I change it again, I will send in a sample at 5k miles.