Sounds like he's stranded, and even if you find an indy with a $90 labor rate, you're still paying for another tow, and the dealer for just looking at it. Not going to save much for the hassle.

MBCA should get you a discount on parts.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!