[Bryan Turner]

Mine does too.

Last year I took it apart and re-seated the o-rings, cleaned and taped the threads, etc. Stopped for about a year, but it's back again.

I'll try oiling the cylinders as a quick fix. Actually, I haven't checked the air oiler in ...er.. ever. Maybe it just needs a refill.. ;-)
--Bryan

[KSky]

I took it apart, cleaned it up and re-oiled it although it still had the original white lube on them as it's only a month old.

Still hisses. I tried to pull one of the O rings off and it looks like they are some sort of non-standard ones. I use this every day so I don't want to break it. Are they really normal O rings I might have in my assortment? They look more like seals that are oblong or rectangular even.