Originally Posted By: dnewton3
Wix/Napa Gold are a decent filter, and when purchased through FleetFilter, they are a smokin' deal! Their construction is quite good; their filter media is reasonable, but not outstanding.
I do believe there are "better" filters as far as actual filtration levels, such as EAO's to name one. However, I've NEVER seen nor heard of use of a Wix filter, failing to provide enough filtration or flow, resulting in an engine failure.
There are really only two acceptable choices for engine lubrication maintenance schedules; routine, or extended. Choose your desired method and base your product selection on the method.
To that end, Wix filters used with routine O/Fci's at say 5k mile intervals (possibly up to 10k mile intervals) do a fine job.
If you desire to stretch past 10k miles, your whole stategy should change from "routine" O/Fci's to extended OCI's, preferably with bypass filtration.
I routinely run a WIX filter in both of my Subaru's for 15,000 miles at a time. UOA's come back with insoluables at 0.2. In this case, it obviously performs in a stellar manner. If I put on enough miles per year, they might do just as well for 30,000 miles...but, I no longer drive either Subaru that far per year, so, I'll never know, as I'll change the filter out once every two years regardless of mileage.