Found this interesting news blurb on www.rdmag.com. "Low Cost Synthetic Oil Demand for high-performance synthetic oils and lubricants is strong, but their cost is high. That may change with a new, simpler way to make a polyalpha olefin substitute (PAO), a key ingredient in synthetic oils. Developers W.J. Heilman, I-Ching Chiu, and Wei Song of Pennzoil-Quaker State Co., The Woodlands, Texas, and consultant James Chien of Amherst Polymer Technology, Amherst, Mass., say a single-site catalyst to convert low-cost ethylene and propylene into a liquid polymer is the key to their process. Currently, PAO production begins with oligomerization of decene-1, which is expensive and in limited supply. The new process, however, uses monomers that are readily available and cost one-third that of decene-1. Furthermore, the process has the capability of manufacturing products with an unlimited viscosity range. PENNSYN products are made directly in one step using single-site polymerization catalysts which produce polymer molecules that are all identical, without isomerization and where the molecular structure can be controlled." Maybe this is why QS syns are no longer Group III?