How accurate are these things? Long short, my dad was only able to get about 5100 miles out of a fill M1 5w20 w/ a M1 filter before the OLM told him the oil needed changed. I assume its best to go by that, but basically 5000 miles on a synthetic fill? Does this seem right? It does see a lot of short trips though out the week (14 miles to work and back.. and comes home for lunch= 28 miles) but does get out on the highway at least once a week for about 50 miles one way. Vehicle is a 2013 Raptor with the 6.2. It gets driven very easy and since its winter time, it doesnt have to haul anything. *Giving PP a try with a MC filter this OCI. It will be interesting to see how different the results are.