It was last changed at 22K - 3 years ago.
I am at 63K now and it is well overdue.
Let us know if you notice a difference if you change it...
When I changed mine, I took them apart, changed out the seals and some other wear items, and
put in progressive springs... 40K later, they still feel great and don't leak, I'm happy not messing with
them... When the springs are out, you can fill them using the "distance from the top" method, instead of
by-volume...
-Mike