I think Amsoil`s top dog is a group 5. If you become a prefered customer for $20.00 a year, then you can purchase Amsoil products at wholesale pricing...

My other vehicle is a 2006 VW GTI, and when I brought the car in for it`s magic 5000 mile service, guess what they whipped out, Castrol syntec, I said to the tech, you`ve got to be kidding me? That`s what VW specs for their synth???, so after the initial service, this car only see`s Amsoil 5W40 synth. I thinks its a bit better...PR...