Autotrader announced its Top Picks for Certified Pre-Owned Deals for September. In September, Acura is offering a new car financing rate for used vehicles: 0.9 percent interest for up to 36 months on certified pre-owned ILX, TL, and TLX models for qualified buyers. Through the end of the month, qualified buyers interested in a certified pre-owned Audi can get 1.9 percent interest for up to 60 months on 2013–15 Audi models. Cadillac is offering qualified shoppers 0 percent financing for up to 60 months and 12 months of OnStar service at no charge. For deal-hunters looking for a midsize or compact SUV crossover this month, GMC is offering 1.9 percent interest for up to 60 months for qualified buyers on its certified pre-owned Acadia and Terrain models. That's a great deal for a used SUV - especially for one that includes GMC's lengthy, manufacturer-backed CPO warranty. Hyundai's certified pre-owned warranty is already among the best in the business, and this month it gets even better: During September, qualified customers get 2.59 percent interest for up to 60 months on all CPO models. Throughout September, Kia's certified pre-owned warranty includes a great deal for those interested in the brand's popular Optima midsize sedan and Sorento SUV: 0.9 percent interest for up to 36 months. Though the term might be shorter than what some drivers prefer, it's still rare to see such a low rate for a used car, especially one with a long warranty. Qualified drivers can get 1.49 percent interest for up to 36 months when they finance a certified pre-owned Mazda in September. Add to that the excellent powertrain coverage included in Mazda's CPO warranty, and you've got a remarkably good deal. In addition to its 7-year or 100,000-mile powertrain protection, Subaru's certified pre-owned program includes no deductible for repairs. That's impressive in and of itself, but in September it gets even better: qualified buyers get 0.99 percent interest for up to 36 months.