Novice restorer here. I have refreshed the steering rack on my 1966 sprite. I have several manuals but on call for 10 ounce SAE 140, the other states Hypoid 90. Which is the one most used and how much oil to fill. There is a grease nipple and a damper plug. Do you fill through the damper plug and use the gease fitting for futher lubrication, and help will be appreciated. Bruce