Well... at least you can find 100% American made synthetic lubricants here in NH.
Gives you about 10% better fuel economy.
Lasts much longer then the petroleum stuff.
Mogger, I am a Amsoil Perferred Customer. That is all I run in my Dodge Cummins diesel and VW TDI diesel. Great stuff.
Come to think of it, I need to put in another order for a case of 15W/40 HD diesel oil for my truck.