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Suction through the filler tube is the best unless you need to change the filter. I use a suction gun with a long tube. Dropping the pan only makes more work and a mess and you won't get any more fluid out than the suction method. Do it a few times a year initially to freshen up the fluid and then when the fluid starts to look and smell used up. I've done it this way for years. (my last 700R4 was still going strong at 175k with no filter change ever when the car was totaled using this method, and if you know 700R4s that aint bad)
Those add on drain plugs won't come loose, but I bet you can't make it stop leaking.
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