Lake Speed has a good video on additives with oil test results, for those that want to learn what additives do - good information.
https://www.youtube.com/watch?v=CAGT5inQScE
I can't find it now, but he had another video on "lubricant bench testing" - which I think was posted here. Maybe ProLong shows this.
One of the ball bearings test at room temp I think.
Which, I guess we all know our engines and oil all run at room temperature.
And the disclaimer ProLong shows in the test.
Anyways - if you want to learn something, review the video.
If you want to mix up your own oil, knock yourself out.
BTW - watch the "clear" oil additive. I'm sure some engineer worked overtime on that product.