This is a very personal decision that only the owner can make. One thing that weighs heavily is the condition of the body. If the body (or coach, to use an archaic term) is in sad shape with rust, bumps, and shabby interior, then you may consider parting with the car. If you aren't overwhelmed and can handle the repairs, stick with it. But keep in mind there will be more repairs in the future. I too am an accomplished DIYer, but sometimes I feel overwhelmed with the work in front of me when I step outside.

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95 E320 Cabriolet, 169K