Extended oil changes are not always fatal to engines. My friend retired about a year ago. His drive to work was about 75 miles each way, for a total of 150 miles minimum per day. He made that ride for 30 years. Never had an engine problem from it. He would change cars every few years, due to them being lease vehicles. He told me he may have changed toil 2 maybe 3 time per year. Mainly because he didn't want to waste time sitting around a garage. He must have did this with at least 10 vehicles, of different makes and models. He wasn't particular what oils the garage put in the cars, or what filter they used. If it was only one brand of vehicle he owned , people would say that's only one case. But he had a car from every US mfgr, and the results were the same. Now that he bought a car he really likes, he still doesn't think changing oil often, is a necessary thing to do.,,