I'm guessing you don't just want to know the job EXPOSED to the most amount of scrap, but rather a job with the most amount of scrap AVAILABLE to you.

I'd have to say working at a smaller, mom-and-pop mechanic shop. You'll be exposed to everything from rotors to radiators and even some catalytic converters...but being a smaller operation they'll be less likely to have something setup already in place to sell the scrap.



Any bigger operation will already be getting return income out of their scrap...and it will just be there in front of your face teasing you!