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I usually drive mine 1-2 times / week so i usually go with mileage but i change oil once a year at least. if you feel this is right then do it. it's your money and time. better to change often than not. i change oil for all my cars between 7000 - 7500 mileage inverval with synthetic oil like mobil 1. i tried Pennzoil Ultra and couldnt tell damm difference and it was little more expensive than mobil 1 so i am sticking with mobil 1 now
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