Not really a fan of Amsoil, I don't use any of their products, Oil and for things like Formula one really have no bearing on Fleet service extended service duration. I am a fan of Cummins Diesel which makes Fleetguard.

Amsoil to give them credit is great oil they are not in Formula 1 but they are in everything from Nascar to every level of Drag racing, circle track, motorcycle, boat, drifting, endurance racing, snowmobile, monster truck, motorcycle drag racing, speedboat, Bonneville salt flat word record speed ect, ect Probably a pretty good indication it's good oil..

This is a U.S based company we are not to much into Formula 1, can't see them spending big dollars to be a sponsor for a race 95% of Americans don't care about, Nascar that's a different story.

Other than that, I find them overpriced for what you get, I am fond of Motul and Rotella T6, I'll be using the Rotella when I change my oil to install my system. my car does not rev to 10000rpms I don't need mobil1 or Amsoil. I need a oil with the right formulation and additional additives for extended oil life and proper wear protection. For me those are the best two oils for diesels.