I once went 9,500 miles with Mobil1. I just didn't feel comfortable with that long of an OCI and thought about changing the oil all the time. I did it once and one time only. This is on my CRV which at the time had about 60,000 miles on it. The same CRV now has 140,000 miles on it and the oil is changed at about 5,000 miles with whatever name brand synthetic is on sale. I am old school and have the old 3,000 mile oil change interval burned into my head. It's hard to teach an old dog new tricks so getting me to change my oil at 5,000 miles was like pulling teeth.