Wow, that's nice. How do they know it has a "cracked piston"? Have they had the head off? I don't think I have heard of that failure mode for a 617 (or any engine) before? What are the symptoms the engine has?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine