I use Rotella T6 synthetic 5-40 oil exclusively. I have used exactly the same oil in my 05's for well 200k miles now, changing it only every 13,000 when the dashboard chirps at me.


No noticeable smell or visual from the tailpipe.


I'll check the breather.


Any other ideas?


Thanks

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Mark in MA
05 MB E320CDI 402k Granite Grey Metallic
05 MB E320CDI 267k Black
05 MB E320CDI 232k White
05 MB E320CDI 209k Tectite Grey
99 Dodge 2500 Cummins 5sp 148k
62 Jeep CJ-6 120k