I use castol edge full syntec in a 10w-30. I know a lot of guys run royal purple and amsoil. I simply prefer castrol because its cheaper, full syntech, and they do all kinds of testing to it and has all kinds of seals of approval an stuff.
never had the misfortune of being dragged there by my wallet but i don't hear many good things lol. if thats the case i'd keep it hush hush too lolI better keep it on the hush hush. Wife may expect a trip to the Coach store. Hate that place! I always leave a poorer man.