My 722.6 was still doing great at 311k when the head was totaled which in turn totaled the car.

Current recommendation for some time has been to change filter/fluid every 36k miles.

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Terry Allison
N. Calif. & Boca Chica, Panama

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