Originally Posted by tig1
40 years of using M1 oils with never an oil related failure such as sludge, varnish, engine wear that could be detected, increased oil consumption, and all at 10K OCIs. All of the other stuff is for others to fret over.
I can see you've had great results and I understand you don't want to change things but I'd find it a little boring to keep doing the same thing for such a long time. I like to try different oils from time to time, to spice things up and keep it interesting.