Ask to see the service history. This will tell you how the previous owner took car of the car.

Other than the harmonic balancer and mass flow meter, my 98 E320 has been trouble free.

Operate all the windows to check the window regulators and sunroof to check for smooth operation.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles