Mine currently says 4% remaining. I'm guessing it's based on milage not amount of oil in the car like oz? It seems from my experience to go to 0% at around 6,000 miles. What happens when it reaches 0% does it go below 0%? can I change my oil at 6,100 miles. I know my oil catch can catches some oil. Once I toss it out i'm guessing that's some less oil. I don't want to run the risk of running out of oil like running out of gas. That's not really how it works right? Does the oil just recycle so it's better to change it out by 6,000 miles? Unless you have a leak you aren't going to have 0oz of oil after 6,000 miles i'm guessing. I'm close to 6,000 but not quite there. I'd rather change my oil on Monday if I can instead of Saturday.