I’ve mentioned several times over the years how Amsoil hydraulic oil has save my company thousands over the years. And how in the 80s through the early 2000s we went extended up to 25K miles with their oil. Extending hours in our ROW equipment. Did oil analysis and became a dealer. Other oils eventually caught up or at least got close. I don’t drive as much retired and don’t go extended. And I drive in town more vs highway. With the changes internally with most engines extending oil drains is not advisable for most people. I’m convinced 5K oil changes should be the maximum. I don’t use one brand anymore. Honda oil, Valvoline, GM, Mobile one and Amsoil. Who’s the best? I don’t know. If I did my own changes I would use Amsoil. All my daily drivers are plus 150K and use no oil. I know Grumpy test all the time with real world results. Can’t go wrong there. That’s my 2 cents.