The car may have saved his life.

My advice is to replace it with another one for the daughter.

Require the son to fix this one or replace it before he drives again. Good lesson for him that he will eventually learn to appreciate.

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html