Thanks guys. To clarify I'm not concerned about the potency of the gear over time but the sterility. When we poke a needles into the sterile vile theres likely trace bacteria that goes in...? If left for weeks and months it's no biggie but over say 2-3 years - probably still fine? Theres also the rubber on the opener vile that's exposed to elements for years, then contacts the pin when we start using it again.
Lol maybe I'm over thinking it. I got bad PIP after my first shot from an old vial...could just be a coincidence. It I get pip a second time then I'll toss it.