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Option 1... tip the bike upside-down,... and drain the oil that way from now on...
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Option 2... if you are sure you have the correct bolt...you're sure?...
Remove that bolt...
...(go to the other side of the bike... (assuming you are a righty)... and put a wrench on the bolt... hold the wrench in your left hand, pressure it toward the rear.. and tap the end of the wrench with a hammer using your right hand... (use short, sharp taps... hitting toward the rear from the from the front of the bike)...
Once it comes off... thank me.. and don't over-tighten the new one...
...(people tend to over tighten these bolts... it's only holding back liquid... it's not keeping your wheels on)... (a little snugger than a soda bottle... soda bottle plus a tiny..."uhhh!")...
Jes' git' it out... I don't think it will strip undoing it, no matter how tight it is... it has a lot of threads...(hammer taps work better than brute force)...
Best luck...
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