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With that little time on it and no signs of leaking , I would not worry about it at this point ..... if you do seasonal maintenance , like servicing the forks , etc. , then you might want to do it , but again , if all looks good , and you do not see signs of leaking , then don't worry about it .... as long as you keep the sand/mud from building up.... then drying , which is what usually kills seals , as the sand/mud will get almost rock hard when it dries , then when the suspension travel goes past that point of the clump , is when the seal will get damaged and leak .... I usually physically wipe my tubes down after every ride , I don't even allow water spots to stay after washing the bike , as they can have Calcium in it ,and that will harden and compromise the surface of the fork tube and then cause the seals to get cut , and then it will leak ,......., but with no leaks and keeping the forks clean , you should be fine for a couple seasons or so . so go ahead and install the cartridges and enjoy the improved ride ...