I'm not brand loyal as I like deals and its just oil. Change every 5k and pretry much it all works and is not gonna damage anything. Rebates are great. I would try the Castrol EDGE Extended Performance to see how your rig likes it. I just bought 2 jugs today with a $30 rebate! Thats BOGO!0
If your mentally more comfortable with the Amsoil thats cool too.