RVTRKN
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Thats the same procedure when filling a lower unit on a outdrive/outboard boat motor. Which brings me back to advertised capacity vrs actual capacity, my new Mercury 150 Pro XS O/B motor says 28.1 fluid oz of gear oil for the lower unit. I pumped in 28oz and found it 1" lower than the breather plug. As per the owners manual instruction, you pump oil in from the bottom until it appears at the vent hole at the top, which was close to 3.5 more ounces.My VW DCT transmission fill procedure was to change the filter under the battery and then fill it from the BOTTOM using a pump to push the fluid up into it until it until it starts spilling back to the ground. That's the same thing to "check" it too. Fill it till it spills over. Crazy.