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Well I am sure some of the degradation is also due to drying out/dry rot. like putting silicone grease on O-rings, an additive might help with this but wether it would interfere with it’s intended purpose by breaking down friction or reducing durometer would be an unknown until it is tried.

Leave it charged, you should purge some from all the tank drains on a regular basis to look for any signs of moisture… the fan will still turn just due to friction in the clutch/hub bearings. The test for if the fan clutch is disengaging properly is with the truck full of air, turn on the main...