Unless you'd left the seal leaking for months, and have your brake calipers and wheels covered in oil, you won't need to add any oil.
They aren't like conventional forks where the oil acts as damping fluid. There isn't any valves or damping rods etc in the legs. It's basically just to lube the stanchions in the sliders and stop them from seizing/wearing.
If your anal over it, measure where the level is from the top of the non leaking slider, and compere it with the leaking side.
Oil quantity per leg is 485 cc

Thanks for the response Colban, but on closer inspection you'll spot that i don't want to take the fork leg offUnless there is a drain point i haven't spotted to empty the oil from?
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Ah,see what you mean.When i replaced my fork oil,i had stripped the front end down to do a few other jobs as well.
There is no fork leg drain plug,so if you do it the Steptoe way,you cant drain the oil and check that exactly 485cc of oil is in there (especially since it has been leaking).
Its not critical so you could just replace the seal as per Steptoe,add a small amount of oil and re-assemble.
Theres nothing in the fork sliders to get in the way should you wish to dip your oil level.
Hello chaps. First post.
Just done this job myself. I am a mechanical dumkoff. It is a strangely rewarding job. There is a drain plug. take the front wheel out and look up the fork leg. There hides a wee allen bolt. This, sire is what you are looking for.
Thanks.