Does anyone know much about Valvoline Maxlife Synthetic Blend for high mileage cars? Is the high mileage designation just a marketing gimmick or do you think there is something to the oil having additives in it that conditions seals and rejuvenates them etc. It sounds like a good idea unless I'm just falling for somebodys good marketing idea. I have 187,500 on a van and thought this may make sense to use.