Tell the kid to bring the car to a dealer for a PPI and get a list of what needs attention. A tired W140 will bite very hard! How many miles on it? I bet it needs suspension work. You can buy like new W140's for $16k, a $4k beat car probably isn't a deal.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200