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Case in point, my mother-in-law didn't put very many miles on her 95 Lincoln Mark VIII, it held 7 qts, at 3k miles in 1 year time frame, I sent a sample off to get analyzed. It came back that the oil was shot. Short distance driving is some of the worst conditions for an engine. Especially if you don't get it up to operating temp as litle88 has stated.
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