Troy Sloan posted:I don't see how it's possible to give anything but a subjective evaluation of the differences a change in oil is making unless there was before and after documentation of everything inside the engine.
Well Troy some of us have engines that talk to us and let us know if they like the oil we put in it or the filter we use. That is how I dialed my engine oil in. In fact I now use my engine as a financial adviser. And sometimes when I just need some life advise I drive out to a private place, park and prop up my deck lid and have a conversation. I go to a private place because most people would not understand me talking to my engine and they cannot hear it talking back anyway.