Looked around forum didn’t find the answer,but if I missed it sorry . Anyways I’m going to change at 5000 miles which I think is fairly conservative for my rough service ( towing ) .taking notice of oil life screen wondering what parameters does the ecu read to show that value, I always assumed run hours ? I will Go with mileage for life of ownership but want to watch any and all . On a slightly different note ,does anybody watch lake speed jr. You tube channel “the motor oil geek” ? Lots of very detailed oil analysis, I had a couple semesters of petrochemical study way way back in college (1970s) the level of detail he goes in to makes my head spin ! Thanks in advance.