Most of these products work in only limited places, and if at all only for a short period of time. they are suppose to soften seal material to allow elasticity to return to hardened seals. Yet if seal is old and hard it probably cracked or the wear lip is worn so oil bypasses it.

 On cycle tried couple special fork oils that were suppose to stop oil weep from seals and found it was cheaper and best in long run to replace the seals.

 Had one truck that had weep of ATF by converter that I put a can oof seal oil in and it slowed it to point where when I sold it it wasn't leaking but for how long ? told them about leaking problem and fix so no intent to defraud.