I have 4 quarts of ST left and 15 qts of NAPA for my Prius. I was thinking of running my oil for 1 year, because I only drive about 4k miles a year, but right now I've had my fill of ST / Fram in for 4+ months, and I'm "getting that urge" for an OCI. Why? Because it's something to do, and I happen to like to do an OCI 2x a year.
I do prefer the Fram filter because it has silicone ADBV and more holes drilled in the open end of it.
I do prefer the Fram filter because it has silicone ADBV and more holes drilled in the open end of it.