Cannot unscrew oil filler cap!

[avacado11]

Hi All-

I've been on this forum before but had to start a new name, couldn't remember the old one!

Anyway- I was unwinterizing the bike today and attempting a simple oil and filter change- but can't even get the darn oil filler cap to unscrew!! I even used a big pair of pliers over a towel, and even that scratched the metal, without the cap budging a bit.

I also tried lubing where the cap meets the case, and tapping (the same trick used for cars), but I think the seal is so tight that no lube got into the threading.

Is there a trick I'm missing? Is it not "righty-tighty, leftie loosie" like everything else on the bike?

I have a shop appt tomorrow but the bike is currently 30 miles from the shop... I got her running but the oil is very low and am not comfortable taking her on the highway without at least adding some oil or doing the full change.

Any help or tips are appreciated!