I grabbed an Amsoil catalog at a show this weekend. Question 1) Looking through it I noticed that there are comparisons to other oils. My question is, why is it that the only oil that is compared to Valvoline Synthetic is Series 2000 Synthetic 20w-50 Racing Oil. Is it becuse Valvoline can't compare, which I find hard to believe, or did it just not compare at all to the other products. Question 2) What group does Valvoline Synthetic belong to?