Yes, no worries as long as that car has no defects and it is in good condition.
73% of new car purchases are financed, according to this website: http://www.newcars.com/how-to-buy-a-new-car/auto-financing.html
What is the average amount financed in an auto loan
One way or another, the loan has to be paid off. If you trade the car in, you can get the payoff added to the amount financed on the new car.
Trading in a financed car involves selling the vehicle to a dealership while still owing money on the loan. The dealership will assess the car's value and offer you a trade-in amount, which is often applied towards the purchase of a new vehicle. If the trade-in value exceeds the loan balance, you can use the excess as a down payment; if it's lower, you’ll need to pay the difference or roll the remaining balance into your new loan. It's important to understand the financial implications, as this could affect your new loan terms.
It varies according to the dealer.
Since the car is financed, it already is collateral for a loan. Your car loan uses the car as collateral for that loan. I think the only way for you to use the car as collateral for a different loan is to have the NEW lender pay off your car loan, tack the ammount of the car loan on to the new loan you are getting, therefore they would then be the leinholder on the car.
No
No, you can trade a used car for another used car
I assume by "financed" you are NOT referring to a leased vehicle but one purchased with a new-car loan. I also assume the vehicle is still pretty new and has very low miles, which is why you mentioned "returning" it. Basically, you cannot return a vehicle. It's not like buying and returning merchandise from Wal-Mart. You must sell the vehicle. The dealer from whom you purchased it might be willing to buy it back, if it's like new, or perhaps you could trade it in for a different model.
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Depends on what arrangement you are able to make with the dealer.