I am considering my first Volvo purchase and have found a few certified vehicles from local dealers that I am considering. They are all '07 with 15K to 37K miles. Since they are certified, the warranty is 6yrs/100K miles. For another $2K, I can extend the warranty out 2 additional years. Is this worth it? Is there a good chance I'll need more than $2K of work down between years 6-8 of service?

thanks in advance for any advice.