Update: The kit arrived over the Thanksgiving weekend and my plan was to remove the starter motor and reseal it today. I have the full service manual, but there's no instructions on how to access the starter motor. It's buried and will require jacking up the lift and removing items from both underneath and from the top side. Before jacking up the lift I remove my drip tray from underneath and it was almost dry (just a couple of drops). So, I checked the hydraulic oil reservoir and found it just over full my 1/4 inch. That made we wonder if I had checked it improperly before. I referenced the manual and it said that it should be checked with the fluid hot the forks lowered and the engine off. This makes me wonder if I had checked it with the engine running and overfilled it. Granted the forklift leaked when I bought it, but nothing to say the previous owner wasn't checking it running and overfilling it too.
So now I am going to run it a few times and see if I get any leaks. I do lower the forks and let it run a couple of minutes before turning the engine off. The manual did say that the forklift will spew out the extra fluid if it is overfilled.
On another note the fellow that sold me the starter reseal kit said my S60XL with GM motor has the 10MT GM Starter. In the manual it doesn't show or talk about the starter reseal kit in the starter section. I did find information on the 10MT and a photo of the seal kit and where the parts are installed. With so many people complaining about the hydraulic oil leak maybe this will shed some light on correct fluid level or that there is a seal kit available.