Originally Posted By: rooflessVW
Oil weights with regard to European oil specifications are arbitrary.
...?!?! Please enlighten me on this.
Originally Posted By: rooflessVW
If it carries LL01, 0W-30, 0W-40, 5W-30, and 5W-40 all have an HTHS of 3.6-3.8.
...actually this is incorrect. BMW too would disagree w/ you as they have both 0w-30 and 0w-40 LL-01's in their offering, each oil used for a different application/ engine. And btw there are LL-01 rated oils with a lower than 3.6 HTHS. But that's like focusing only on one facet of the story...
Originally Posted By: rooflessVW
So really, your "observation" makes no sense at all. Where do you people come up with this stuff?
...from Porsche AG technical papers and track days observation. There are Porsche Club members who noted 50 grade oils (vs. factory recommended 40) reduce output and increase coolant temperatures simultaneously on the track.