I did this on ramps at the backend. Drained for half an hour and then filled with 2.4 of the three 500ml bottles before excess started coming out. As I let the excess flow back out, I wondered...why? Seems counterintuitive. I plugged it while it was still flowing back out. Will I have any issues from draining and filling while the car is on ramps, and plugging it when all excess had not escaped yet?
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