john, i work in the lubricant industry and my company attends several industry shows per year.conversing one on one with consumers i am constantly told by "john q public"that his purchase of xyz "full synthetic" in essence guarantees his oil to be completely serviceable for light years.i have personally listened to some of the sales pitches that are used and they are really mis-leading.so much is touted about the equal-sized molecules and the extreme low pour point that it would be easy for the average person to be pulled in.as we know many companies believe anything is fair in sales pitches to the general public; no matter how mis-leading.if an oil bottle had a label which read "22%, or 24%" full synthetic the consumer could at least have an indicator.the same applies to "mineral/dino oil" as well i.e.this bottle contains x % pure mineral oil.