When you pick up a new car, inspect it on the spot and keep the invoice and the three-guarantees certificate (三包凭证); if a major problem shows up in the first 7 days or the first 60 days, you can demand a replacement car or a refund

In plain words

If a major component such as the engine or transmission breaks in a new car's first 7 days, you can demand a replacement car or a refund outright. Within the first 60 days or 3000 km, failure of the brakes or steering, a cracked body, an oil leak or a battery fire also qualifies for a replacement or refund. Within the first two years, if the same fault has been repaired many times and still isn't fixed, you can also get a replacement or refund, but you pay a usage compensation fee based on the mileage driven.