Having spent most of my life in the trucking industry (most of the time as a factory marketing rep.), I've seen many diesels wear out. And, something in the engine can break. But, most cars don't go the high mileage as commercial trucks, so your statment as regarding only cars is, in general, true. Just change the oil regularly - and the air filter. Have a great day.

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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback