See also:

Fuel Additives
To provide cleaner air, all gasolines in the United States are now required to contain additives that help prevent engine and fuel system deposits from forming, allowing the emission control system ...

When to Check and Change Lubricant
It is not necessary to regularly check front axle fluid unless there is a leak suspected or an unusual noise is heard. A fluid loss could indicate a problem. Have it inspected and repaired. ...

Warranty
OnStar equipment may be warranted as part of the new-vehicle limited warranty. The manufacturer of the vehicle furnishes detailed warranty information. ...