My manual doesn't say how much oil to put back in it, just up to a certain level.
Let me know how it goes since I want to change the oil in my shock also but wasn't sure about taking it all apart like the manual shows. If doing it through the bleed hole works then why go thru all the other hastle?
The manual says to remove the spring, let out the gas pressure, adjust the damper to the softest position, let the oil out from the bleeder and pump the shock to get all oil out, install the bleeder bolt, remove the gas reservoir parts, "pry at the gaps in the stop (I'm quoting on this one, they're talking about on the shock body where the shaft goes out from it and they show inserting two pins into the shock body to move some keeper inside it) with suitable tools to free the stop from the rear shock body", "slide the stop up to the top of the push rod then lightly tap around the seal with a suitable rod and mallet and push the seal assembly 10 mm down and remove the circlip", pull out the push rod assy, pour all remaining oil out.
assembly:
install the bleeder bolt, pour SAE 5W oil into the gas reservoir till 60-70mm from the top end (with the shock upright), put the bladder and top into the shock, pour SAE 5W oil into the shock body till 45mm from the end, put the rod assy in and pump it up and down to get all air out, push in the shaft seal and fit the circlip into the groove in the shock body, pull up the push rod assy against the circlip, force the stop into the body by lightly tapping around its edge with a mallet, pump the shock up and down several times and leave it in the extended position for 3 minutes, remove the bleeder bolt and let any oil flow out until it stops, if no oil comes out then add oil to fill it, install the bleeder bolt, with the shock extended add nitrogen to 170psi, install shock spring.
So it could be that by taking off the bleeder bolt that you only let out the gas from the shock body. You'd have to dissassemble the gas chamber to change the oil in there. Which is fine since it don't look too hard.
Did you have to remove the spring and pump the shock to get the oil to come out?