If the ad description is a true representation of the cars condition I don't see anything to scare you away. If you can confirm that the coolant leak is only at the thermostat housing (sixto has a good suggestion on that) then that and everything else is fixable.

__________________
Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD