I am giving some thought to replacing my 97 E420 with 130K with a 03 E500.
The E420 is still driving like new and has been very reliable. Should I just drive the E420 to 200k and not look back, or would a E500 be a reasonable buy. The reality is that I do not want the maintenance of the E500 to exceed what I would expect on the E420...

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)