Your scenario is rather unrealistic in that any auto (at least any in my possession) always has an assortment of tools, including some that are specifically designed to effect routine maintenance and emergency repairs and deal with the predictable raoadside hazards.

Perhaps it would be profitable to recast the proposition - what kinds of tools should you carry in order to effective use/dismantle/alter your auto in a survival situation?

I must say I am not very enthusiastic about ripping my car apart. At least not when there are other options. But this is a fun thread. When we have exhausted the possibilities for cars, we can move on to planes, boats, steam locomotives, ATV's.....