I use full synthetic (Mobil 1) but still have it changed by 4,000 miles. I know that's early but I'm just a creature of habit and like knowing it's good and clean. I have the Honda dealer do the changes (2009 Accord V6) but they allow customers to bring in their own oil. I buy the 5 gal jugs at Wally World and save a little over the dealer costs. I kind of liked doing it myself and not dealing with the dealership but don't miss crawling under the car then having to deal with disposing the oil.
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