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do check the filters but sounds to me like the ole #1 cylinder head gasket failure...Just can't burn off the oil being dumped into that cylinder. I have experienced this with a #17 head at 240 k miles. Very common problem with this model 603 engine as you probably well know. It will make you think its a turbo problem but unlikely.
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 Western NC
1987 300SDL W126 Turbo Diesel 335,000 + miles
1976 300D W115 275,000 miles+
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