These engines are known for blowby compared to most diesels. Have you ever pulled the oil filler cap of a VW diesel. Wow, it will blow your hat off and thats a new engine. The MB's are somewhat the same. Don't worry. If you can blow by other vehicles up a 7% grade at 70mph you have a good engine. Blowby is a sign of a worn engine with low compression. Low compression=low power and lots of smoke.

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Mark
82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel