In Reply to: oil pan plug posted by Kriss (ORE) on July 08, 2018 at 18:06:27:
Place combination wrench over plug. Hold in place with jack. Using larger second combination wrench, place closed end of second wrench around first wrench.
(Place the open end of the first wrench into the closed end of the second wrench)
This effectively gives you a "Cheater wrench" and the additional length might get it loose.