Before using a 'cheater bar' - may I suggest a gentler alternative ? Try PB Blaster or Kroil several times over a few days.It worked for me.
And put some anti-sieze on the threads when you replace the filler + drain ?
my 2001S had the original oil in it and it didn't look too bad. I drained out 2.8 L and put 3 back in. Pelican says it should hold 3 quarts...so if you buy 3 1 liter bottles put it all in.