I've worked for a few used car dealers in my time and I would not trust them to sell you a good car.

They'll buy a car for a certain price, jack up the price of the vehicle thousands of dollars and sell it with a down payment equal to what they paid for it. Many do nothing to the car at all except maybe charge the battery and check the oil before they sell it.

I'm sure there are good decent used car salesmen out there but... they are hard to find. If you find one - sing his praises.

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Codifex
1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)