With two major automotive companies set to release plug-in hybrid vehicles by the end of the year, extended warranties become more important than ever for protecting your vehicle. The Chevy Volt and Nissan Leaf are both due to be available late this year. While cars like these are good for the environment, their engine is more complex than a standard piston-powered car. In addition, their rarity makes replacement parts quite expensive. Dealers provide standard powertrain warranties on new vehicles. Yet this warranty only covers the engine, transmission, and related parts.