This is another idea too, buy a low mileage good running M116 and drop it in...

Or I suppose a M117 could too but I think there would have to be electronics change overs. EZL/ECU for sure.

I think my shop charged me somewhere around 600-800 to swap in a different M103 in my 190E. I figured $2,500 all said and done to buy a motor, address whatever seals/external things that you should do while its out and drop it in.

Or buy a rebuilt motor.

Adsit lists on at $5600 but they provide no details (suppose I could call) but I have not heard many good things about them. Idk.

Metric Motors is $8900.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
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93 300E 195k