How many miles is it safe to use a oil filter before it really needs to be changed? Reason asking is I use to run Mobil Dino oil and ran 5000 miles before filter fluid change. Mobil Dino is $11 at Wally world for a 5qt jug. Mobil 1 is $22 for the same size jug. I am going to switch and double my OCI to 10,000 miles. I know people are going to say I can go farther with that oil blah blah blah but what about the filter? If I have to change the filter I am going to change the oil while I am under there. So how long is a filter good for? 10,000?