What I have been able to research is it is mineral base oil (converted from Natural Gas that is 99.5% pure), so says Pennzoil. It has similar NOACK as AMSOIL but in comparison to AMSOIL SS it does not have the extended drain interval for oil changes. Based on the Pennzoil data sheets oil interval changes are based on Manufacturer Recommendations. Cost wise it is cheaper in comparison to retail prices of AMSOIL SS.
If you become a preferred customer of AMSOIL ($20/year) Signature Series oil is over $2 cheaper a quart than this Penzoil. Preferred Customer allows you to buy AMSOIL Products at wholesale prices, approximately 25% below retail prices.
Becoming a Preferred Customer: http://www.amsoil.com/shop/by-product/buy-wholesale/?subcategory=50&zo=5251070