Its a proven performer and it come from the factory in Porche, Viper and Corvettes to name a few. It may cost about twice as much, atleast Mobil 1 does, but when you stop and think about how long you can leave it in there and how many people here have had it sent out and tested and then told it still has life left in it, why wouldn't you run it. Don't forget the oil filter, Mobil 1, Pure One or the K&N gold to name a few, you need a quality filter when running the extended interval
