What kind of truck? Most of those oil change indicators are nothing more than mileage counters in the computer that the oil change tech resets when the oil is changed. I have to do it on my mom's 2014 Chrysler 300 when I change the oil or else a message pops up, even if I just changed it. I think on her car it's set to go off every 5000 miles which is the factory spec'd oil change interval.
