New AOS failing?

[epapp]

Bought a new AOS and bellows from a dealer a few months ago. I needed the part quickly as my original bellows has a gaping hole in it (and decided why not do the whole AOS). I forgot the exact part number that I got from the dealer but I checked it at the time and it was the newest revision for MY99. I installed the new AOS and all was well.

After checking the J tube over the weekend, it has oil in it, I would say just as much as when I was using my previous AOS, which didn't have any symptoms of failing besides a bit of oil in the J tube.

Is there any reason a new AOS would do this? I expected a bone dry J tube.

Thanks