Not necessarily, although informally it seems there are a larger number of failures in climate where roads are salted and in coastal marine environments. The heavier engines (E300 and E420's) also seem more prone.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)