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Even if the female hex is in excellent shape, the oil tank plug can be very difficult to remove. Overtightening it previously doesn't help either. Use a 3/4" dr. socket and flex handle on your female-to-male hex adapter for less flex and a 4' long pipe for added leverage.
Then there's ultimate torque with a large impact gun. It might work or it might create more damage (and instant oil drainage) if used overzealously.
One episode of experiencing a stubborn oil tank drain plug convinced me to replace it with a Fumoto ball-valve. No leaks, no grunting.
Sherwood
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