Turbo Diesel oil in intake manifold?

I was changing the glow plug harness in my 1994 S350 (168k) and took off the intake manifold to get at things. I think I found where the blue exhaust smoke is coming from. The manifold is caked with thick
oil residue that looks like it has been there for years, but also has a thinner layer on top that looks rather recent. I can trace it right back to the turbo. My guess is that there has always been a little bit of oil coming from the thing, but now there is a lot. Looks like I'm down about a quart in 1500 miles. Haven't noticed any oil loss before the last oil change - at least not much (always leaks a bit here and there).
Are there any seals or gaskets or whatever in the turbo that can be replaced?
What to do?
Thanks
-Dave Walton
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The intake manifold will be caked with soot and oil. Soot from the EGR system - normal - and a bit of oil from the crankcase ventilation system aka as "the breather" - also normal.
I believe there's a vent hose from the top of the valve cover over to the air cleaner or some point on the air passage to the turbo's air inlet. There's always a bit of oil in the crankcase fumes and it is what you see inside the intake manifold. Normal. Don't blame the turbo, they rarely fail.
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Are you aware of this 3.5 L diesel's reputation for bending its connection rods?
Oil consumption - usually past the #1 and #4 pistons - is a symptom of greater things to come. Owners of these engines have not been a happy lot.
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I have come across references to this engine problem here and there, but was unable to find anything that covered it in detail. Is this fixable?
Thanks
-Dave Walton

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Although M-B denies that any design defect exists, they did produce a heavier version connecting rod. However, I recall something about it having limited availability which doesn't make sense but that's what I read.
The problem is well known, especially to owners of the engine. I believe I may have some pictures of the connecting rods and will try to email them to you directly. I'm not an email expert so don't be surprised if nothing appears. Tom
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