Originally Posted By: JeffGoji
Originally Posted By: lonestar
5WX and 10WX can be made from crud (Gp II or Gp III) oil. 0w takes more expensive Gp IV or Gp V synthetic base stock to produce.
I thought all of Amsoil's full synthetic line used Group IV base, including the 5W30 and 10W30 stuff.
The XL line is like Mobil 1 and uses some Group III.
Do you know something about Amsoil's blending that we don't?
Kaboomba said, “5-30 and 10-30 are cheaper to make, using less sophisticated chemistry and additives than 0-30. Also, some vehicles really work best on 5- or 10-30.”
I said, “5WX and 10WX can be made from crud (Gp II or Gp III) oil. 0w takes more expensive Gp IV or Gp V synthetic base stock to produce.”
I did not say that Amsoil 5W or 10W non XL line of oils were not what Amsoil says they are.