Thanks for the responses guys.

ILUVMILS: When your dealer has done these repairs, what bearing are they actually replacing? The center thrust bearing for the crank shaft? All the crank bearings? Any of the piston bearings? What did the customers have to do at your service center to basically have Mercedes warranty this defect? Does the dealer measure the fore/aft play on the crank before pulling the engine? Do you know the spec?

I feel every time I start it up in the morning, I'm doing damage, that I know will eventually just keep exasperating itself to the point where it might let go in the future. The car knocks louder after it sits hot for 30+ minutes than it does in the morning. Its a shame, I absolutely love this car, everything about it. It sux that I have little piece of mind about the motor. I'm going to call the dealer today to yet complain AGAIN. Frustrating.

Thanks so much for taking the time to respond to my questions. It is MUCH appreciated.

Andy

One thing I forgot to ask, if nothing is done, what is your opinion on the longevity of the motor? Will it progress do you think? Stay the same? Thanks!

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K