I've got a '99 Suzuki Swift (basically a Geo Metro clone) that uses the 3614-numbered oil filters. It has about 115K miles on it. About a week ago I changed oil in this car, took off a SuperTech ST3614, cut it open, and examined the media. Since I've owned it, my service internals on this car have been about every 3K miles. (Reason for that mentioned later)
Now a little history on this car: I bought it several years ago when I thought gas was going to hit $10 a gallon. I saw the service history on it and the previous owner did 15K service intervals performed at WM with them using SuperTech oil and SuperTech oil filters. I was really leery about buying the car, but gas was going up about $.20 a week at that time, so I rolled the dice....
My first oil change had me use a 5W-30 oil and all went well...for about 2K miles. Then the oil light started coming on at idle. It turns out that the oil pump pickup screen was plugged up. I dumped the oil and filter, cleaned the screen, and started using 15W-40 diesel oil with about 20% MMO for about 10K miles, changing the oil every 2500 miles. I have stopped using the MMO, went back to a 5W-30 and oil pressure is back to normal.
ANYWAY, I just took off probably the last SuperTech ST3614 oil filter that I owned, cut it open and looked at the media. I was surprised at how much media this filter actually had, with more pleats that what previous Wix or Purolator PureOne have had for this application. The media had a lot of hard material in it, so much so that I'm going to continue with the 3K service intervals, probably using classic Purolators or Wix from now on. As mentioned, MMO is no longer being used as I feel that the oil is doing it's job and there is not a need for MMO any longer.
For this application, one that is easy on an oil filter, the SuperTech E-core was a good filter.