Besides the notorious head gasket, test the climate control, and make sure the AC compressor kicks on. If not, thats probably going to cost a bundle. Check out the suspension components, with careful attention to bushings, front and rear. Make sure the sunroof works, another expensive fix. Other than that, pretty reliable car.

Good luck

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K