do you have a pipe thats big enough to go over the wrench? PB blaster is a penetrating oil. spray it on, and it helps loosen stuff up. usually PB blaster + blue wrench (be careful, PB blaster is flammable) gets the job done. you are probably going to need a new bolt if you've sufficiently fucked up the head of this one. its the whole center piece of the filter assy. not just a cap screw or something. if you cant get it with that, you can use a bolt out. it will fuck the head up real good, but it will get it out. it should be 14.5 ft/lbs too. dont put it back on too tight.