This will protect not only you, the buyer, but the seller well. if you are dealing with a reputable seller, this should not be a problem for them.
Some dealers will take a car owner to believe that the guarantee can be purchased at the dealer or manufacturer, but that is not the case.
As an incentive to buy vehicles, manufactured goods were touting their guarantee program still vehicle.
This means that you get the use of GM extended warranty for the entire period shown.
* Oil change: A car must have its oil changed every 3,000 to 7,000 miles, as an integral part of car maintenance.
Depreciation, which is the loss in value over time, is also the biggest cost of owning a car.