Hi I’m the owner of a standard 6/1972 Datsun 240z, which I recently changed the clutch on (with a new clutch kit) because of an oil leak from the rear main seal. All went well on the install and when I finished I began refill transmission with gear oil (Pennzoil Synchromesh). My owners manual calls for 1.5 liters of fluid in the “transmission case”. I ended up filling the transmission, but it never came overflowing out of the fill plug hole after using 2 bottles (which is roughly 2 liters). Should I continue filling until it flows out or hold off? I should also note I had the transmission upside down for couple of days and small amount of fluid did drain from what I believe is the breather (metal circular piece.)