doesnt our car have a 100k rust warranty?....add on portection packages are a high end polish/wax type....most have warranty's that come with the application. you use to hear a lot about oiling the under, of your car but its really a thing of the past just keep it clean and you should be fine. its always good to take out the wheel liners after winter to get the salt out and make sure the insides of the doors get clean thats where most cars rust