Originally Posted By: Danh
Originally Posted By: windeye
when did the PP reformulated?
Not sure precisely when, but PP on Shell's website shows Noack of 12-13%, while the recent PQIA test of a number of 5w/30 syns showed around 9%. One could speculate this means PP now contains some of the GTL base stock now used in Ultra. [/quote]
What Danh said. There is even a completely different PDS for their PP 0w20 compared to what the specs are listed under the common general one. Lower VI and lower NOACKS point the finger to higher quality base stocks with less viscosity improvers.
Originally Posted By: windeye
when did the PP reformulated?
Not sure precisely when, but PP on Shell's website shows Noack of 12-13%, while the recent PQIA test of a number of 5w/30 syns showed around 9%. One could speculate this means PP now contains some of the GTL base stock now used in Ultra. [/quote]
What Danh said. There is even a completely different PDS for their PP 0w20 compared to what the specs are listed under the common general one. Lower VI and lower NOACKS point the finger to higher quality base stocks with less viscosity improvers.