2021 Forester Limited
Not sure I see the need for this or am I following your notes??? If you aren't opening the fill plug, how are you getting fluid back in if all you have open is the drain plug? Getting to the fill and drain plug appeared to be no issue at my service two weeks back.It save me from trying to open the fill PLUG which is above drive shaft, hard to get to area.
I used electric 12V pump instead, which I bought at Amazon for $20. the pump is intended for sucking oil from dipstick hole. the barb connection of the pump is for 10mm ID 3/8 inch ID tube, so I used 3/8 ID, 1/2 inch OD flexible tube from Homedepot / Lowes . 1/2 inch OD tube fit snaggly without leak, into check hole of front differential.
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That is a good technique indeed