So I got the Subaru WRX this week and I accidently deleted it a couple of seconds after it appeared in my garage whilst deleting a bunch of nuisance cheapo prize cars that get dumped on me as strange and unusual punishment for winning the co-ops. I gotta confess this has happened a few times now. 
Now you should get an immediate option on prize co-op cars whether to accept that car or accept the credit equivalent. But that’s not what this thread is about.
I think there needs to be an option in the menu whilst selecting a car that makes the car ‘undeletable’. It’s an option you control and you can make that car deletable again if you must.
But it’d something that makes a special car that you don’t want to lose, a car that you can’t just delete accidently.
It puts the car behind a ‘double lock’ before you can delete it and should be automatically turned on when you get a rare/premium seasonal/monthly car in the garage.
It’d be great way to eliminate one of the unforced frustrations with this game.