the e320's of that vintage had the m104 motor which has some issues like head gasket and the engine wiring harness..... Make sure you have your local dealer pull a VMI to see what has been replaced.

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2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL