Pretty sure I am over $10,000 this year in repairs so I would vote yes. Mine is a 2006 4.8is and had about 25k on it when I purchased it last year. I have heard of Route 66 but I haven't had any dealings with them. I do think they are reputable though. Personally when it comes to warranties the key is making sure it covers as much as possible and then use it as much as you can...

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2006 X5 4.8is