A series of conditions need to be met when buying a car by loan, one of which is that the lender must be at least 18 years old and have full capacity for civil conduct. Minors are not fully mature in law, so they usually can't meet this condition. Buying a car with a loan also requires signing a car purchase contract and being able to pay the down payment, which usually requires a stable job and income source. The lender's credit record is also an important consideration, and no overdue record or bad credit information is helpful to obtain loan approval.