With the costs of repairs to this car, simply due to its MB heritage, you'd be nuts not to have a 5-year bumper-to-bumper warranty, 7 if you can get it. You can buy different levels of protection - the best level would cover everything on the car except the usual expendables, like tires/shocks/brake pads/etc.

Shop around, buy the best plan for cash or add it to your note. You'll sleep well.