My 90 560SEL has 241k on it and has been fed a regular diet of Mobil 1.
No oil leaks or consumption.

Just swapped it to a good friend for my old 250C, so I'll have to see how it runs from afar from now on.....

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