Nice video leading to a clear explanation why changing oil timely/frequently is good. Challenges 10k intervals depending on use (lots of shorter trips like probably many of us do, towing etc) and conditions (low outside temperatures). I can see our 3UR-FE does not have these low drag piston rings given the era it was designed in (and the MPG it gets...), nevertheless the oil ring needs to move and comply.
Added a link to a nice explanation of various piston rings involved.
And picture of a 3UR-FE piston. Note oil return ports.
P.S. AMD is a Toyota Master Technician. He seems to have good knowledge, certainly experience and I like the way he explains things providing some confidence. He has a good one on the Land Cruiser 200 itself, as posted in another thread on this forum. By the way I have had Toyota change my oil at 5k and 10k to date. Will stay the course with 5k changes and look forward getting past 36k miles warranty to start changing myself.