Jag tror historien är att Doc trodde att DeLoreans var snygging:
Marty McFly: Wait a minute, Doc. Ah... Are you telling me that you built a time machine... out of a DeLorean?
Dr. Emmett Brown: The way I see it, if you're gonna build a time machine into a car, why not do it with some style?
Besides, the stainless steel construction made the flux disperal... Watch out!