Does anyone know the difference between the original Pennzoil Ultra Euro L 5W30 and the new Pennzoil Platinum Euro L 5w30 that is being sold today? I can't find anywhere on the old bottle that it says it's made from Natural Gas(like the new bottle) or was the old made from crude oil? Any difference in test results with the old vs. new flavor if you will? I still have (2) oil changes worth of the old stuff left on hand. Thanks.