quote:
Originally posted by TallPaul:
According to the MSDSs not all grades of Synpower are the same.
From the current listings at the Valvoline site it shows the
following CAS numbers:
20w50 has about 70% of 68037-01-4
5w30 and 10w30 have about 58% of 64742-54-7
5w20 shows about 10% of 68037-01-4 (they don't tell the other CAS numbers)
Some time ago I researched these CAS numbers at this site.
It showed that the 20w50 is mostly PAO, whereas the majority
of the 5w30 and 10w30 are Group III. But maybe Valvoline
made a mistake. Hard to imagine a Synpower PAO 20w50.