If theyre going for realism then theyll have more than one type of car, for example...
2007 Sentinal - Shiney and new!
2001 Sentinal - Looking a bit dated, still good condition
1992 Sentinal - Battered interior, rusty bits
1986 Sentinal - Faded, dull, battered, rusty and unreliable engine!
Just picked those years because the sentinal looked quite differant in them all. That would be a good feauture