looking on redlines site ALL OW oils have a noack of 9, the 5W20 is 8 aka less lighter base oils + 5-30 + up goes to 6. these REAL synthetics are synthesised + use the necessary components to reach the desired spec. although expensive they likely still factor in controlling the cost to make the product. Esters are said to be very expensive + likely used as needed. look at other high end oils like Motul you see even more costly products as they MAY use more of the costly polyol ester based oils. there are other esters as well + only the pro's will know the FULL truth about various formulations! looking at their RACE oils their 20W aka 5W20 has a noack of 6 + likely more Ester + is more $$, still looking their 5W DRAG RACE oils has a NOACK of 12 + recommended for oil temps UNDER 160F. so even Ester oils that are lighter have their limitations but when winning is the only thing + parts are changed MORE than our underware its whatever works-wins!!