Yes it can!!
If that car can passed the Carliforia Diesel rule, and you can find a Transport Department approved center to test it( Which you can't), you can have a register as Private Car
But as I know, Vito's diesel cannot pass the rule
2007-10-28 18:27:12 補充:
Gasoline Version of the Vito can be register as Private car, you fool!!!
參考: A proper brain inside my head, Such Transportation Dept