Manufacturer warranties last up to a certain number of years or until your car reaches a certain mileage. So a 5-year/60,000 mile warranty will cover your car for five years or 60,000 miles, whichever comes first. Powertrain warranties, which cover your engine, transmission, and drive system, typically last longer than bumper-to-bumper warranties, which cover everything from the front bumper to the back bumper (minus the bumpers themselves).