I don't know if that's entirely true. The clearances on my current day Subaru are definitely tighter than my old Subaru, and my 1985 BMW had extremely loose clearances comparatively. My Outback uses 0-20 as factory recommended, which has a higher flashpoint than the older recommended 5-30 and 10-30...….at one point, some Subarus were burning up cylinders because of the higher emission standards. This is ameliorated by using better oil for the task, as I understand it.
My old '85 BMW used 20-50 by factory recommendations. Engines have continually become more advanced, and continually gone to lighter weights of oil, yet with few exceptions the cars are more reliable than ever......especially American cars. American cars during the 80s and 90s were complete fucking garbage.
I think there's a lot of people these days who are confusing the cart with the horse and who's pulling. I would imagine it's a bigger deal for some cars than others, though.
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JRB, @
Aray, anything to share?
(ETA: Darth Uno, accidentally quoted you at first. Sorry about that if you got an errant notification.)