Mine with 244k runs great....although I just had to have head gasket replaced. At 277k, you really can't COUNT ON getting much more out of the tranny....although you might. I'm aware of some of these cars getting over 400k. Who knows how long they could go if really well taken care....I'm aiming to find out!

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife