From what I have read, the Indians have licensed the 616 design from MB and are producing in their country for domestic use. They have updated the design (or used features from the 617) to make it a turbo.

If built to German manufacturing tolerances, that would be a great diesel engine for something like a truck or even a W123. Unfortunately it probably could not pass emissions here.

What you are seeing is probably an aftermarket turbo kit. Highly inadvisable since the engine is not "beefed up" to support it like the 617.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles