Releaserustedbolts

Options for releasing rusted bolts include:

• kroil
• penetrene
• diet coke
• diesel fuel
• pb plaster
• ATF mixed with acetone
• Fluid Film
• heat
• cool
• tighten slightly
• tap the bolt to set up vibration
• bolt-grip http://www.irwin.com/tools/screw-bolt-extractors/5-pc-bolt-grip-expansion-set

Or some combinations of the above

Source: http://www.garagejournal.com/forum/archive/index.php/t-160517.html