I would take the 420 over a 560 any day, the difference in power is not that much. Plus you don't have to deal with the possible problems with with rear hyd shocks. These were a hard ride from the factory, and expensive to fix if there is a problem.

On a 420 you can just change the shocks for a part cost of less than $200. for OEM shocks.

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1994 E320 Cabriolet
1992 300CE (Sold)
1991 300SE (Sold)
1986 560SEL (Sold)