I've had my deflators for about 3 years now, and unfortunately, they haven't seen much use this summer (ok, any use). I spent some time today checking their settings before I hit the trails this weekend. The blow off valves in all 4 seemed to stick a little, and the end PSI would vary by up to 4lbs.

I took them apart and there was an ever so slight amount of "gunk" in there (on the "piston" thing). I wiped it off with my fingers but it didn't seem to matter.

Are they just sticking from lack of use, or do they need to be lubed every so often?