Under the parked menu, enter trip info, enter trip, then go down with the minus button 3 times, in there you will find an option to reset the trip mpg hold + for few seconds and then a message to confirm with plus button will appear, press it once and it should clear your mpg data. Thanks for watching.
Usually, you should follow what it says the maintenance manual of your truck. But for the company I work, we do oil change every 20,000 miles for long haul and 750 engine hours for local trucks, using Mobil Delvac 10W-30 synthetic oil. If you idle a lot, for example local owner operators should perform oil change base in engine hours. Try to find your manual online, so you can have a better idea for your ideal oil change interval.
In the trip or leg screen, hold + for 3 seconds, it will ask you if you want to reset the data press + one more time and it will reset both (trip and leg) at the same time. Thanks for watching.