I reset the reminder but pay no attention to it.
Just go by the mileage. No more than 5k, 6 if you have to. Please don't go 10k. All your doing is asking for trouble. This is of course you're running a full synthetic. No need to make it more complicated.
I dont trust the mpg computer to begin with. Gret reference but that's all. You have to fill up, zero trip, and devide miles by number of gallons on next fill up. I know everyone knows this but this is the most accurate way to measure mpg. I commute almost 40 miles one way every day. Mostly...