I'm looking at purchasing a '10 GL550 w/ ~58k miles, great condition and is MB CPO. I wanted to know if anyone on here has experience with the "unlimited warranty" and how good it is? I've had mixed experiences w/ CPO's and had one MB CPO but the car was flawless the 3 years I owned it ('05 E55) .. Any help would be appreciated.

Thanks

 

Is it just one year with unlimited miles or can you extend to three years?