Miles. I think the whole thing about every 3 months is a sham..... Does anyone really know how long the oil was sitting in the container prior to you purchasing it, and dumping it into your engine? Oil doesn't just break down because it sits around (if it does, it is going to be so little that you will never see a difference). You already said that you drive it easy, so if it looks in good condition, just go with the miles, and don't worry about the months.
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