This is in contrast to compound interest, which calculates total interest based on both the principal and accrued interest.
If you want to know how much interest you’re paying, ask your lender for an amortization schedule, which shows the principal and interest paid each month throughout the duration of the loan. If you’re still in the preapproval process or you haven’t selected a car, you can always use an online car loan calculator to find a mock amortization schedule based on your interest rate, principal, and the length of the loan.