Take one of your best selling car lines..Oldsmobile.Take two of it’s very popular models. Do little or no modifications to them and convert them to diesels..GM never thought the added stress and compression from the diesel conversion would blow head gaskets and rip cylinder head bolts out while the cars were in the showrooms.. As with thick headed GM of the late 1970′s it was an answer to a question that nobody asked. Another problem was the Delta 88′s and 98 Regency’s that got the spine shaking diesel engine were known for being a smooth luxury. When the diesel would shake off your radio knobs it just didn’t go woth the image of the car. GM wouldn’t try another diesel for many years and Oldsmobile never recovered. 
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