...Mercedes made a diesel engine for the W140 sedan. The diesel W140 was sold only in Europe. So the swap that you're contemplating may be physically possible. You may wish to check into this further.

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Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

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