Originally Posted by
Pickles
Mike, I have done that before, however in this situation that suggestion is very bad. Many dealers and oil change places really torque those bolts down. Try vice grips first +penetrating oil. If that doesn't work, then use a screw extractor. If that doesn't work, then get someone to weld a bolt onto it and impact it off. That's always the order I use for stuck/stripped bolts
Edit:although as others has said it probably isn't stripped. Its quite hard to strip a torx head.