Most cars nowadays have to be professionally serviced. My Intrepid had to go to my indy to have a battery changed out (engineers shoved it down behind the passenger side front wheel), and just to change out a headlight bulb.

My advice? Get a mid 90's W124 E320 wagon. You'll be a lot happier.

EDIT: I realize this doesn't answer your original question about the modern E350 wagon. However, it goes without saying that older cars are much easier to work on yourself. A modern engine compartment will barely accommodate a normal human hand unless you take half of it apart.

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Never be ashamed to ask for help.

1985 300D
1987 300SDL
1970 Jaguar E-Type OTS
2002 Dodge Intrepid (Traded In)
2011 Ford Crown Victoria