Is it possible that there could have been just water in your car's cooling system at some point in the past, and that it subsequently froze?

Not sure what else could crack a block. Could washing a hot engine with cold water do it?

Good luck with your 240D...

- Patrick

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1982 240D. 198k, Marine Blue/Blue, 4 Speed, Crank Windows, No Sunroof, No Rust, No Oil Leaks
2001 TDI. 197k, Lagoon Blue/Black, 5 speed, Chip, G60/VR6