Originally Posted By: nap
Originally Posted By: Gokhan
[...] All these said, you can interpret these results as a modern SAE xW-20 would pass these tests, despite the unusual bearing design.
you're again at building a strawman and attacking that one instead of the original question... and you don't even get points for successfully doing it.... the word "would" is indicative of wishful thinking but nothing more than that...
Let me repeat the original question: which laws of physics have changed since 1977?
Oh, I see, I am the one, not you, building a straw man here?? Despite you making claims like: Laws of physics don't change; let's use 1977's oils and knowledge. Anything that is not rated ACEA A3/B4 will destroy your bearings.
You hadn't (couldn't) even read the paper and made false statements based on its abstract.
Of course, it's not about laws of physics being the same.
However, I'll repeat what has changed:
(1) They hadn't even defined HTHSV in 1977 yet and you took the cP numbers as equivalent to the modern definition. 3.5 cP mentioned there is as little as 2.5 cP in the modern definition.
(2) They found out that the base-oil type greatly affects their results. The key to the tests were very high oil temperatures. The high-temperature performance of 1977's VI = 100 base oils are no match to modern base oils with VI = 120 - 140.
(3) Bearings used didn't have any overlays, which is never the case in an actual engine, even in 1977. They didn't directly apply to real-world situations.
(4) How many bearings using xW-30, which have HTHSV
You have posted so many falsehoods in this thread. I'm surprised that the others have been so nice to you despite you constantly insulting them on top of your false claims.