You'll get better responses on the Tech forum than OD.
Your mileage is pretty low; even less if in Km's.
I'd say you are VERy unlucky and recommend getting the codes read using SDS at a local dealer before replacing outright. The car's made to run at high speed; shouldn't have contributed unless cooler is clogged or was low on fluid.
Trans service every 10K is pretty often. I beleive the recommended interval is now 66,000KM(?) Your trans (722.6) would only use MB's trans oil; no other equal.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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