It's probably not possible in most of EU because there is a limit for cash transaction which is I think 15 000 Euro (not sure if EU wide, but definitely here in Slovakia), over that you need to do a bank-wire transfer. All new cars are paid this way - or you purchase it with a loan / lease and don't need to put down this amount of money at once. Most new car dealers don't even have a cash register and would not take such an amount of money from you in cash. This is due to prevent money-laundering.