Has anyone used Mobil 1 for it's extended mileage oil change. I read the numbers are 15,000 miles between changes. They did a test with a chevy v8 350 and ran it 25,000 miles with good results. I know someone who did this when it first came out with a new chevy with a v8 350. I'm pretty sure they did the 15,000 mile oil change but for some reason 30,000 mile change sticks to mind, lol. They had good results too. I'm not sure but I would think they changed the filter at least once during that period of time and added oil as needed. Even if I'm wrong about the 30,000 mile change I know it was least 15,000, miles. So was anyone brave enough to do it? Maybe "brave" isn't the best word, lol. I never used Mobil 1, all my vehicles were so old I just added oil until I felt good and ready to change it, lol. Worked for me but I knew what I was doing and was ready to fix anything that broke myself since I'm experienced.