If its cranking, then check your fuel filter. If its not cranking at all then the oild had noghting to do with your car breaking, but I have to ask.....why would you do this to yourself? Remember that disclaimer before Mythbusters starts "Do NOT try this at home!"
you must drain the tank,unless your tank is low,fill the tank to dilute the oil,if you can get the engine started from under the hood,then chances are that you can burn off the oil,by running the car for a few hours,however that will require fresh gas,until you sufficiantly dilute the oil.
wow. you'll have to take it in and have the tank drained. you'll probably have to have it towed there, as I wouldn't even try to run it like it is if I were you.
Drain all of the fuel from the tank and put in fresh fuel
At the start of each show when they say "Don't try this at home" Which part didn't you understand.
Even if you own a diesel, you shouldn't run straight cooking oil. You need to run the cooking oil through a bio-diesel still. Mostly what this does is remove the glycerin from the oil so it will not give you any problems.
What kind of engine do you have? I hope it is a diesel, if not ho boy it going to cost you. Hope you can work on your own car, if not maybe 1,000.00 or more.