Around $1200 + parts for the dealer around here...not much less at an Indy, they've all made their prices just about the same.

Doing it yourself....under $300.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Since your friend is skilled at pro level, and presumably trustworthy, why don't you ask him what he would charge for the job? Using his price would be the best way to maintain the relationship The scope of the work can vary quite a bit depending on what, besides the chain itself, needs replacing.

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'79 240D

PLUS add that cost of the special mercedes tool once again to do this job,, $200 $250?

There is now a Chinese made Tool that costs about $25 less. However, there used to be some in the Tool Rental Section.

Tool Rental List
http://www.peachparts.com/shopforum/showthread.php?t=291660

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84 300D, 82 Volvo 244Gl Diesel