No pennzoil 0w-30 only comes in the platinum euro lx and no it isn't recommended by BMW either like you say, has no BMW approvals for it but like i also say its a good oil and it should be continued to use, just not at the long life inervals. Euro lx was discontinued by Pennzoil then renamed as Quaker state euro Lx 0w-30 but have the same exact certifications which also lack BMW's
And no i did not recommend to use supertech. i recommended to use the Pennzoil platinum 0w-30 for longer than 3k miles or 5k kilometers and half year intervals in his n55 first instead. I said if the wanted to keep shorter intervals he could switch to a cheaper full syn oil as long as it also is the same grade. But also
never recommend a switch to it first, nor did i recommend a different viscosity, or to maintain anywhere near the same intervals as the proper long life rated oil, rather shorter ones. And just like I said in my early response
I wouldn't recommend using supertech, rather to continue to use the Pennzoil 0w-30 for more than 3k miles first. I didn't say to switch first thing. And i don't use supertech like i also stated before. I use an LL-01 rated oil unlike that 0w-40 i see..
So i take it you're using against using an oil that isn't for a vehicle yet the Pennzoil 0w-30 technically isn't the right oil for the vehicle either, has no BMW ratings at all just like supertech. You use non BMW rated castrol edge 0w-40 yet that non BMW rated oil is something that can be used in the car. wouldn't BMW disagree with?
Your statement "You recommended something that should never be used in this car" is funny. You say it yourself that "There are numerous other variables (which we discussed here numerous times) that are part of the approval. Oxidation, deposits, evaporation, shear stability, stay in grade requirements etc. I agree that many parts of approval variables are designed to bump OCI. But there is much more to it" and you're right.
Castrol edge 0w-40 is not BMW certified for Oxidation, deposits, evaporation, shear stability, stay in grade requirements ect anymore. It may have been before but if not anymore than it's no longer suitable. It doesn't belong in there either by your standards... But then again we can run whatever we want in our engine. But I'd switch to Quaker state euro 5w-40 if you haven't already