If you have any records on the car, that is always helpful as icing on the cake.

Run the VIN with a service writer @ a Mercedes-Benz dealer to see what VMI (Vehicle Maintenance Inquiry) all has been done to the car since new, at any MB dealer. They'll print it out for you too at no charge, if you're nice and courteous about asking for it.

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'06 E320 CDI
'17 Corvette Stingray Vert