I change my oil every 5K miles using Mobil 1 5W-30. I read an article on Edmunds that talks about every 7800 miles. I do believe that every 3K miles is ridiculous. http://www.edmunds.com/car-care/stop-changing-your-oil.html Should I go with 7800 miles? If yes, how often should the filter go? The AC Delco PF-48 is a pretty inexpensive and changing it more frequently is not a big hassle. What do the other forum members think.