Originally Posted by ncfisherman

You would need to ask about the service history of the fork. If the fork didn't receive regular service(at least once a year), it is possible that the stanchions are worn and could need to be replaced. Also ask about when the seals have been last replaced -- this is a wear and tear item. If you see any oil pooling up around the seal wiper or signs of oil dripping down the lower legs, that is a sure sign of worn out seals.

Here's what my friends Fox 36 stanchions looked like when I recently serviced his fork. This is what happens when a fork hasn't received any maintenance:



Typically, that kind of damage can only be seen when the lowers are removed.