That 10% is basically how many miles you’ve driven based on the manufacturer’s maximum time between oil changes.
HOWEVER
You should check the oil levels every month or so because cars, especially ones 5+ years old, will burn oil so you don’t want your oil level to get low. That is a sure fire way to blow up an engine. I usually change mine based on the filter life. I have a 5,000 mile filter and drive 10k miles per year so each filter/oil change lasts me about 6 months. The first Monday every month I spend 3 minutes checking the oil level and topping it off if needed. I’ve never had an engine problem doing it that way.
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