I decided it would be best to just go ahead and change the fluid. I couldn't get the plug out even after soaking with penetrating fluid over night. The impact wouldn't even budge it! I put some heat to it with my little mapp gas torch and hit it with the impact again and it came right out. I guess I'll have to monitor the fluid more closely in the future.

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1981 240d (The Diplomat Car), 1988 Dodge W250 (The Bruiser), Volvo 262 (The Never Ending Project), 1972 Duece and a Half (Will Winch Over Anything)