I know there are a few air gun folk on here, I purchased my FX2000 around 2001 it was used many times to keep the rabbits in check on my Mums farm.
Back in 2010 it was put in my loft, between my brother and I we had made a good show of reducing the rabbit population, when I put it away I put a note in the case 'October 2010 showing 50 bar on gauge' every now and again I would check the rifle when I had need to go up there. It's now nearly eight years since it was put away, and it still shows 50 bar on the gauge, I find that pretty impressive or is this the norm, it's still on it's original seals.
I bought a full seal kit for it back in 2011, as I'm sure it will be needed some time in the future.