Randy, after starting cars hundreds of times at temps at or below 20 below zero in the somewhat frigid, at times, State of Minnesota I've never once had any of my auto oil filters blow a case apart. Has Phil Lockwood run across this situation a lot on Rotax engines using auto filters? That would be a little un-nerving.
Some years ago Ray Volk and myself spent several hours between a bunch of auto parts stores trying to cross reference a Fram filter for Ray that would work on a Rotax and had no success. Back then Fram didn't show one that would fit a Rotax.
I hope I have as good of luck with the Rotax filters as I have with the NAPA. I'm sure I will and anyway I like buying them from John.