When u put it in did you put butloads of grease on it and make absolutely sure the seal was seated on the crank snout before pushing it down? If you roll on the rear half of that seal and make sure it's straight then you can slide it on. If you're not careful the lip of the seal will fold and leak. Theyre very sensitive. I put aftermarket ones on my 94 when I did my rebuilt and no leaks yet so I don't think it's the quality of seal. Usually if PCV makes them leak it'll make more than just one leak, especially when u replaced one and the rest have high miles on them it'll make them leak next.