Typically the TP is saturated in about 3k miles ..or so I'm led to believe. I don't think that there is too much to stretch here. In the case of a Frantz ..it's the media that gets saturated ..not the oil wearing out per se`.
I'm into really extended OCI ..so it would not serve me too well. In my case it would mean 6x TP changes a year. Far too much for me to tinker with.