Used to use Castrol GTX in my Truck and Mobil in my wifes car. Then the "Synthetic craze" hit and I started trying new oils and now Iam totally off the wagon, I ussually have no less than 5 different oils on tap and treat oil changes like a fat kid in a ice cream store and dont know which one to choose. I am to the point it takes me longer to decide what oil, I want to use then actually doing the oil change. Id really like to become brand loyal again, but the oil companies are so competive and with stores like Advance, Autozone, Pepboys and Walmart all running so many specials on so many oils, It aint happening. I dont mix oils, so now I have all my oil brands devided by 6's into oil change kits, Oh, yeah, I am sick.