[Brock]

just depends on who you want to believe....and whether you think independent tests performed at a manufacturers request are still valid. I have read a lot and still would use Mobil 1 or Amsoil before Royal Purple. I would use whatever you are most comfortable using at change intervals you are comfortable with...as in the end it is your vehicle.

that is why America is great...we got choices we can make based on money, reliability, protection, knowledge, recommendations, science, etc. Then we choose which is most important and put out our money.

Plus my quote says Mobil 1 is routinely one of the best oils. It is... Some use different additives...different way of going about the same thing..and because of this their products put more emphasis on one part rather than another. I know with my Cummins diesel...they definitely did not recommend Royal Purple. If I remember right it was Rotella and AMSOIL being recommended by the mechanics...