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Steel plug in an aluminum (or mag) case leads to some electrolysis. Heat might not help much.
I wouldn't do channel locks. Too much impact wrench might round out the plug then you're really stuck.
Make the socket in the fill plug is very clean. Scrape the corners with a pick.
Apply penetrant and let it soak. Maybe try the 1/2 acetone + 1/2 ATF stuff. Reapply and soak some more.
Tap (lightly) the allen wrench into the plug with a hammer to make it stick. Use your big extensions, breaker bar, cheater pipe - brute torque time.
I apply some PTFE tape to my drain and fill plugs to help removal next time.
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