I poured the new oil directly from its bottle. I just nipped a little bit off the conic tip and tilted it inside the differential.

There is enough room to tilt the bottle upwards so you can get roughfly 90% of the contents inside the differential. I had bought a second bottle so I put the remaining 10% of the first bottle in the second bottle.

I checked with my finger and the level was below the plug maybe 1/2 inch. I tilted the bottle carefully again and squeezed gently until a small amount of oil came out the refill plug. Cleaned the excess...torqued the plug to 43 ft-lb. And that was it.