Understanding how your vehicle warranty works can help you to know what to look for next time you purchase a vehicle.
First you must remember that a basic automobile warranty usually covers all parts and mechanisms but usually fail to cover oil filters, wiper blades and other parts that are subject to wear and tear. Warranty coverage specifically concerned with batteries and tires are usually purchased separately. Most car owner’s manuals offer an outline of what you may need.
Equipment concerned with emissions is required by law to be covered for two years but a warranty that lasts 8 years is also required on certain components.
For more details on warranties and what you have to have covered by law, read the full article here:

Warranty and Roadside Assistance Coverage