Both my 00 C230 and 05 CDI have been running well, no issues.
195K on the C230, 187K on the CDI.

Not the original fluid in either, so maybe that helps...

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles