Things we should already know as BITOGers, but this video does help confirm ...
- too much oil in the sump will aerate (foam) and cost power and lose pressure
- UOAs won't see all particles; the little device he does use to see stuff over 10um help prove that larger particles are not very prominent, at least when the sumps are reasonably clean
- to really understand how the oil did, you must have a VOA to judge vis and oxidation, etc so you can understand the delta (change) in each characteristic or parameter, as every batch will be a bit different, every oil brand will be different, and certainly they will be different between spec changes (SM, SM, SP ...)
- spending more won't always get you more; paying 2x more money won't often return 2x greater performance
My additional comments:
- these tests run do NOT indicate any manner of longevity for use; these were dyno runs comparing/contrasting power and don't address duration of use (extended OCIs). In this video, he is using "performance" merely to describe wear control and power in short-term testing. This does not address long-use oxidation, cleanliness factors, etc. If these lubes were run for significantly extended OCIs, there might well be a distinct separation of many traits of wear and cleanliness, oxidation, vis, FP, etc ...
- these tests ignore the statistical variability regarding "normality" (though he does acknowledge the existence of variation, he does nothing to account for it)
- I'm not a fan of his "total wear metals" method; I don't believe adding data values for separate elements is a good way to understand "wear"
- singular UOAs are NOT by any stretch a proper way to compare/contrast one lube to another; small sample sets are rife with variability which cannot be accurately predicted without decent quantity of data (30 samples min)