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I think this is why owner's manuals usually state that the oil should be changed 1) more often if the car idles a lot (e.g. usually every 3,000mi/3mo to 5,000/6mo but older cars could be more) and 2) the oil should be changed at a monthly interval even if it doesn't reach the mileage interval (e.g. every 3 months or 6 months, depending on the manufacturer's recommendations, even if you only drove 1,000 miles or less during that time).
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