0% downpayment is basically working around to the system for most people. This will typically mean marking up the value of the car for the bank to see in order to secure a higher loan. The only time you can purchase a new car with 100% loan is for a commercial vehicle or private hire vehicle.

There are companies offering 100% loans in exchange for higher interest rates but it is highly not advisable to buy a car without having enough financing as you may find difficulty servicing your loan if you do need to sell your ride before fully paying for the car.