All you have to do is go to their website and read the FAQ page.
8. What’s the difference between Mobil 1 and Mobil Super Synthetic?
Mobil 1 is part of our ultimate line of advanced full synthetics. It uses the latest in additive and base oil technologies that provide superior protection, and outperforms Mobil Super Synthetic. It meets both GM’s stringent dexos1™* and Europe’s ACEA performance standards. More car builders recommend Mobil 1 by name than any other motor oil brand in the world. More NASCAR® drivers use Mobil 1 than any other motor oil brands. Mobil 1 has provided exceptional performance throughout its nearly 40-year history and stands alone as The World’s Leading Synthetic Motor Oil Brand.
Mobil Super Synthetic is a full synthetic that uses synthetic-base oils. It outperforms our conventional and synthetic blend products. It meets or exceeds the latest industry requirements, GF-5 /API SN. The product offers performance consistent with many synthetics in the market.