That first thread is shows super aerated oil - you can see all the bubbles. What kind of tractor was this from? Was it overheated? How was the oil drained? Perhaps tractor has a pump that is cavitating or sucking air in the system somewhere?
That's not normal, and not at all representative of my results with SUDT2. I made the switch because I was really just curious - it was an inexpensive upgrade over a normal oil change. I'm a skeptic by nature and didn't expect any noticeable difference. The results I got where shocking. VERY noticeable decrease in hydro noise and much smoother operation. My oil is smooth, clear, and clean like vegetable oil.