BANKRATE -- Auto loan finance rates moved up slightly last week. The average interest rates for both new car and used car loans were as follows: 72 months: 6.44% 60 months: 6.59% 48 months: 6.83% 36 months: 6.79% *Interest rates are nationwide averages for past week, and not necessarily reflective of those offered through our service. OAC your rate may vary.