My recently purchased 03 sable with 3.0 duratec has a rounded off oil drain bolt. 1st time for me changing this car's oil. Not much space to get in there 2-3 inches so drilling is not an option on the vehicle. Tried some of the bolt extractors that fit on a socket with no success. Bolt is on very tight and rounded off so looking for ideas on how to remove it. Tried gripping with vise grips but they were a small pair. Larger pair might work better. Any other ideas?