You should be aware of and above the warranty on wear, which results in damage, improvement and guarantee to the oil spills.
This is important because there is a restriction on the allowed mileage when renting a car.
There are federal laws on these, too, but you need to know how your state handles the issues so that you can be in the driver's seat, so to speak.
Some factory warranties cover the powertrain for 5 years and 100k miles, but only to cover over 3 years and 36k miles.
So when something does not work in your car, you can instantly repair when and where you want.
One thing most people do not even realize will come with most of them is the roadside assistance and lockout assistance too.