PFTE = Teflon. Costs a bit more, but on the directions, its states "Use of this seal with a repair sleeve is not recommended".
I wasn't sure if "not recommended" meant there would be a problem with it or if they were implying that the seal would work even with the wear groove. I installed it w/o the sleeve and everything seems OK. I had replaced the original leaky seal with the normal Felpro seal and it leaked after about 3 months. Actually, in retrpsoect, I don't know that for sure.. I had to clean/seal the gap where the oil pan mates up at the back of the engine as it was leaking too. I did that by scrubbing the metal with brake cleaner 4-5 times and then laying down about 3 layers of black RTV Silicon. With those 2 things, its has not leaked for more than a year now.
I also used a normal seal+sleeve, and sillicon treatment, on the red car and its not leaking either.