I have a 2006 Specialized with an OEM Fox DHX3.0 rear shock.
Is it the Air version? I know a few places have stopped servicing those.
My 2006 DHX Air was the only shock I ever had any problems with, it sort of stopped having any sort of rebound damping, which admittedly made mu jumping skills a million times better, if a little uncontrollable – I connected my shock pump to it because I was told by some fool that you could fix any shock issue by removing the air, compressing it to full compression and then pumping it up again – as I turned the last thread on the pump BAM – the end of my shock pump let go and oil sprayed all over my kitchen wall.
I gave my Float X CTD an air can service the other day, so obviously I’m now a total expert on all things suspension – IMHO for shit to get into the damping unit it would have to completely ruin the spring part, so as long as the seals are good (so it damps properly) it’s probably alright. The oil may degrade a bit and the seals will wear eventually – but I’d say the performance drop would be negligible. I’d say clean and lube the air can twice a year and have it services if/when it starts playing up.