I used to have a 93 Mustang GT. We put 31 spline Moser axles in it with the C-clip Eliminators. On the instructions it read the same way AND said for racing only. Extended street use would cause them to leak. Well after a while on the street, sure enough they started to leak. Re-installed them with silicone again and it still leaked. We ended up sending the axles and Eliminators back to Moser for a new style that was more street friendly. They seemed to work much better as far as leaking.

Probably not much help but that's my experience with the C-clip Elimnators