My issue with this is, when in use in an engine that's not on a test stand, there's a lot of fuel entering the crankcase. the 4-5% we sometimes see in an oil analysis is only the tip of the iceberg as a lot of it evaporates quickly. This becomes part of the "base oil" for all intents and purposes, but is volatile and very prone to oxidation.
It's obviously good to have an oil that's stable, and I've always tried to go for those oils since learning the difference but I've seen what the move from A3/B4 to C3 oils did to gas engines, it's nasty. In the US the move has been more gradual and not combined with ultra long OCI so the change wasn't that abrupt or visible. In europe the change happened overnight almost. "Bulk tank is empty, we've ordered some *new* oil, guys".
I want the clean base oil with the high concentration add pack. And I'm happy to pay for it as winter season lasts too long for me to have 1 oci throughout. it was fine on my diesel, not on the turbo gdi.