I was shopping at walmart this morning and I was in the auto section. I will be changing my oil soon. I noticed that Mobil1 high mileage 10w-30 was not "resource conversing" and the 10w-30 Mobil Super High Mileage which is a synthetic blend had the symbol for "resource conserving ". My question is why is the full synthetic not resource conserving? If someone could clear that up that would be highly appreciated. Thanks