Manual Steering Box Oil and Adjustment

[NewToW113]

Hi, I have a lot of slop in my steering, I have confirmed the coupling bushings are fine and my other wear components (tie rod ends, etc) are new, so now I'm focused on the steering box. 

While I find plenty of PS discussions, I have not seen any good posts that outline the correct procedure for filling/ greasing the manual boxes, or adjusting them to remove play.  Any help is always appreciated!

Joe

[spearson65]

I'd also be interested in the type of oil used for the manual steering box as well as locating the fill port.  1968 280 SL.