First off, Schaeffer's is an excellent product. Their 7000 series of oils are a mix of Group II+ and PAO (A true blend) with a higher concentration of synthetic than most blends. They are purchasing their Group II+ from either, Chevron, Shell, Mobil, Petro Canada, or Flint Hills, not sure which one at this time. The main additive package is either Ornite or Lubrizoil. They add Moly at a stronger rate than most and they add one of their special additives, Pentro.
Salesrep, if I've missed anything please add.
If I had not spent 21 years with Pennzoil and retired with Pennzoil and were not using Pennzoil Platinum, I would be using the Schaeffer's #704 in my cars. Again, it is an excellent product.