Car Maintenance

<p>We discuss car maintenance. How often should you change your oil? Is buying higher octane fuel worth the cost? What is knock and how does it affect engine performance? What type of tires should you buy? What does a tire alignment actually do? How do you tell what are necessary repairs vs. optional repairs if you don't think your mechanic is being honest? When and how should you replace an old vehicle and what's the best way to go car shopping?</p>