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I know that this is an old post, but I am having the same quandary. My reason is that I only drive my car about 2500 miles per year. Yes, I do autocross 8-10x per year, but I don't consider that to be overly taxing on the engine since the actual racing/driving time is limited to 4 minutes in the autocross.
Do I need to change the oil every year given my lower mileage? If so, is using synthetic oil still justifiable?$$?
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