07-03-2020, 03:49 PM
I am using SAE140 in my RP's steering box, having had difficulty with grease climbing the steering column. It appears that the worm acts as an Archimedes screw and winds the lubricant up the column on right hand turns but doesn't bring it back on left hand turns. Oil runs back, but grease tends to stay put. Result: the column gradually fills with grease and it exudes from under the steering wheel all over your nice clean best trousers. I speak from personal experience, and graphited grease stains are the very devil to get out!