A nice ride, crisp handling and the solid feel make any Golf a good choice. The 2.5's engine lacks refinement and fuel economy is middling. The diesel TDI gets excellent fuel economy, but does not meet emissions regulations. Many of these TDI versions have been bought back by VW as part of a settlement with owners and the EPA.
In most cases, automotive warranties are based on the vehicle identification number (VIN), and the warranty will be valid regardless of ownership. The dealership can tell you exactly how much warranty is left.Read more about extended warranties