Gents,,, I too,, do not recommend a turbo be added too a NA engine, it seldom works right, as the man said, the NA engines are not set up for the turbo, an it causes problems.
When the factory adds a turbo, they do not just hang it on, to a NA engine, about 6 or so things must be changed, things you cannot do too the NA engine. The factory turbo engines are built as special models for the turbo to be used.
I have seen many of those add on turbo kits an they always have problems, one thing for sure, the added on turbo always shortens the service life of the NA engine.
Not sure on the Mercedes Diesels, but many of the other brands an models of factory turbo engines, have different crankshafts, an especially rod bearings, sometimes pistons an rods too are made stronger. The reason is the higher bearing loads caused by the turbo. There are some other things too, injection rate, injection timing, an more issues than I can remember tho.
Also, since piston cooling is via oil sprayers, the oil pump is likely to be a high volume unit, especially designed for the turbo engine. Since the turbo increased the power of the engine by about 1/3,, the extra wear an tear on various engine bearings must be taken into consideration.
I think that my '81 300D which in NA, should last me about 100,000 miles more than the same engine with a turbo, for me thats about 5 or 6 more years of service, no way I would hang a turbo on it, an I have one laying in my shop too, its a spare for my '78 300SD, which still runs like a new engine.
For what its worth frm a pro tech, 50 years making a good living as a Master engineman, an instructor,, both Navy an civilian.(GM)
Doug
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