Add some gas to Motor oil,possibly 1oz gas to 20ozs oil,you will end up with an xlnt mixture,something like Liquid wrench to soak threads/nuts with,to help loosen them,& It will also burn similar to Diesel fuel of which could be used as a lantern,It would also stretch your supply of Flammables a bit more or could be used for explosive effect for signaling or Depredation purposes should something out there,Deem you as a meal!Tranny/Brake fluid mixed with gas would also work real well & would be better for a Lantern as it would burn cleaner!Mix straight gas with extracted foam from the seats,& you'll end up with a Haste version of Napalm,of which could be an Xlnt signal assist or Pursuade those higher up on the food chain or Zombie hordes!:)

Tranny fluid and diesel 50/50 is better than nearly ALL penetrating oils commercially available, research has proven this.

Ironwood

That's what the antique car guys use to unseize an engine that's been sitting for decades. I find that Liquid Wrench works faster for things like rusted bolts though.

As an aside: I have been using tranny fluid (leftover stuff) mixed with the dregs of 5W30 containers as my go-to quick lube. It soaks in very quickly and then stays tenaciously. Great stuff.

I guess a little homebrew penetrating oil could make it easier to get some of the small bolts loose on an abandoned car. It still takes a lot of torque to get them off though.