I know that the base stock of most oils is usually a blend of different types or groups; e.g., a little bit of grp IV, some of grpV, more of grp III, etc. And I know that the exact formulations are proprietary, but I wonder is there any rule or practice that says in order to be advertised as, say, a PAO oil that the oil contain at least 50% or more PAO?
There is a rule (I think it comes from the Fed BATF) that says in order for a wine to be labelled as Cabernet Sauvignon, it must be derived from at least 51% cabernet sauvignon grapes. The rest can be vintner choice of blending grapes like merlot, etc. I'm wondering if there is something similar for motor oils.
And while I'm at it, is there any motor oil today that is advertised as a grp IV PAO? I remember that you used to see that in marketing literature, but I don't see it any more (probably because grp III+ is good enough for most applications). Instead, you see references or claims that the oil base stock performs like a PAO or rivals the performance of a PAO; e.g. Pennzoil Ultra Platinum GTL base stock.
There is a rule (I think it comes from the Fed BATF) that says in order for a wine to be labelled as Cabernet Sauvignon, it must be derived from at least 51% cabernet sauvignon grapes. The rest can be vintner choice of blending grapes like merlot, etc. I'm wondering if there is something similar for motor oils.
And while I'm at it, is there any motor oil today that is advertised as a grp IV PAO? I remember that you used to see that in marketing literature, but I don't see it any more (probably because grp III+ is good enough for most applications). Instead, you see references or claims that the oil base stock performs like a PAO or rivals the performance of a PAO; e.g. Pennzoil Ultra Platinum GTL base stock.