The only verison of the 616 with a turbo is available only in india. I dont want speculate the damage the turbo is causing the engine never mind the transmission.

If I were you I would run. Its too bad the car looks really good besides the turbo. I wouldnt pay $3k for it.

http://www.absoluteastronomy.com/topics/Mercedes-Benz_OM616

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)