1. Introduction
I'm NOT an oil expert but wanted to share some of my own Virgin Oil Analysis results. The larger file that contains Rotella T4 10W30, Rotella T5 10W30 and Valvoline Premium Blue Extreme 5w40 are my personal own analysis I had paid for through Black Stone Labs, the Rotella T6 5W40 and the Amsoil 5W40 are from other individuals. All oils are CK4 rated.
2. Discussion
From these results, by the numbers (Anti-wear, Detergents, Dispersants, Viscosity) it would appear that Valvoline Premium Blue Extreme 5W40 is the better "Full Synthetic" oil out of all these samples to include Amsoil.
Another interesting observation is that there isn't much of a difference between Rotella T5 10W30 Synthetic Blend and Rotella T6 5W40 Full Synthetic. And if you really think about it, why pay more for synthetic when the anti-wear and additives packages are similar between the blends and full synthetics.
Something interesting to note is that both Rotella T4 and T5 10W30 do not meet Fords minimum Phosphorus levels of 1000 PPM, yet both are on Fords approved oil list.
3. Conclusions
In my opinion Rotella T5 10W30 is just as good as Rotella T6 5W40 (when comparing the numbers). If you want to pay more for a full synthetic then thats up to you. These tests don't reflect the base oil quality and that is where one could debate which base oil is best, but when comparing the other packages they are all similar. And it shows that Amsoil is NOT the best but is similar to the other brands.
Again, I'm not an oil expert and don't have all the answers, but I find it interesting when people just say Amsoil is the best yet have no proof to show for it except for "I know a guy, who knows a guy, who knows an uncle that says Amsoil is the best" or shows test results from Amsoil and only Amsoil.
I'm not saying Amsoil is a bad oil, I just think all their hype is not worth spending hundreds of dollars for their product when I can go down the street and pick up Rotella or Valvoline. But to each their own.