Oil filling bottle trick - GIF

Oil filling bottle trick.

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Previously:

Bulk bag filling attachment - GIF
Filling a concrete mixer from a distance - GIF
Filling a yacht pool with seawater - GIF
Filling buckets with grease - GIFs
Filling motor oil with a dipstick - GIF
Grease gun refilling plate - GIF

That oil looks thin for a differential. Usually, 90W oil was used but that may no longer be true.