Interesting Oil Change View

You can run a bit longer if you use diesel oil (CJ grade). It has more detergents to suspend the carbon, which is a much bigger issue in diesels. However, in a newer car that has an optical sensor, it would still see the black and flag "oil change needed". A rodder friend used to use a special remote Franz filter that used a roll of toilet paper. He claimed you never needed to change the oil no matter how black, but I think the carbon build-up is the main issue. Whatever, you do, don't ever use the cheap "non-detergent" oil you see in dollar stores.