Rebuild, meaning new cylinder liners, rings, and bearings? Care to relate what they quoted? One place in Southern CA which sells rebuilt OM617's charges ~$8K for a turbo one. Sounds like yours is non-turbo (.951) which have much more affordable pistons.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans