15%? try 5% or 0, you can go further too. It's just a reminder.
You should always check your oil, take the dip stick, wipe it, drop it in, pull out the stick, examine the viscosity of your oil, the colour, the smell. if you think it needs changing, change it.
Check it often, you need to know if you are burning oil, or losing oil. top it off if it's too low, worst thing to do is just rely on an automatic system to make you change your oil.
My first oil change was at 12,000km. New cars it's every 10,000km, or approx. 5,000 MILES. (6,213.97)
It all depends on how you drive your car too. Like I mentioned above, check your oil, if you think it needs changing, change it. Otherwise, just keep going. 10,000km is what my service meanual says. I'm almost at 40,000km and due for my 4th oil change, still have 15% on my maintenance minder. Check my oil every few fuel fills, it's all good.
My service guy told me when it hits 5% I should book an appointment, 0% is still fine.