I tried using a 12v oil pump on my car a couple years ago. It worked on the BRZ but you had to push it in-out to try and vacuum up the rest of the oil. This risks scaping off plastic bits into your oil. When I tried it on my old 90's Toyota Camry it ended up snagging and biting the end off the tube. In the end I decided it was not worth the risk getting stuck in the tube.
With a fumoto valve I can get the job done much faster, less effort, less risk.
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