It's been suggested via independent lab tests conducted by the PQIA that very low volatility basestocks have found their way into the lowest range of PZ and QS products. Natural Gas GTLs have outstandingly low volatility. This occurred during a time when the price of oil was high; a 'normal' situation. Since then, oil prices have plummeted and a subsequent independent test of a PYB 5w30 showed an average NOACK %. One could be led to logically assume that PZ reverted back to standard baseoils during this time simply due to economy. Now with the price of oil climbing back up, SOPUS may deem it smart business to return to their excess of GTL coming out of Pearl. It's worth it to keep an eye out on future PYB analyses to see if that holds true.