Often wondered but never asked: what qualifications and or minimums of the base oils are required to be allowed to be marketed as synthetic in North America? I know GRP 3 is the minimum standard but does that constitute it must be 100% of GRP 3 or above? Further, what is the dividing line in the refining process to move up from GRP 2?
The reason I ask is when I look at the PDS for Castrol GTX Magnatec 5w20 that's marketed as a full synthetic their properties look very similar to that of a GRP 2 conventional (specifically the SG). Is Castrol moving the goal posts again like they did a number of years ago with the dispute with Mobil? Are they using a higher percentage of a high molecular weight base oil like PAO40?
Very curious indeed. Your thoughts?
The reason I ask is when I look at the PDS for Castrol GTX Magnatec 5w20 that's marketed as a full synthetic their properties look very similar to that of a GRP 2 conventional (specifically the SG). Is Castrol moving the goal posts again like they did a number of years ago with the dispute with Mobil? Are they using a higher percentage of a high molecular weight base oil like PAO40?
Very curious indeed. Your thoughts?