Likely the SV series if from infineum, but we can't be sure. Aren't xom known in the industry for their "ability" to tweak some packages and get their product approved by the oems? @Foxtrot08 pointed out in some thread that they don't rely exclusively on infineum. Maybe at some point they tweaked some "Inbrizol/Inbriztonite" pack, and i bet that they do have some pretty good connection with vanderbilt, basf, lanxess, akzo or evonik. Why would they do that? Maybe because they just can. How did they get the approval? Maybe they had or have some mb/vw/porsche engines lying around in their lab
Any blender can tweak additive packages if they want. If you solubilize your own additives, it’s even easier.
That said to meet the A40 specs, I’m not sure if you need to send a sample to get tested. Or if it’s a self certified test. Independent test. Or if it’s something where if you follow a specific blend, you can just certify it as it was done by the additive manufacturer.
The wording I found on the A40 test is vague. But it seems like you send a sample to Porsche to test. And pay for the test. Then it’s pass/fail after that.
So they may change additive companies, or change blends slightly, perhaps a bit of mix and match, to get that spec. They may use infinium additives with maybe a Lubrizol Vii. Or maybe A mix of a few things.