Originally Posted By: lubricatosaurus
Originally Posted By: CATERHAM
Originally Posted By: lubricatosaurus
The thinner the oil, the more time the engine spends in boundary lubrication conditions.
Not necessarily and only if the oil is being operated at temperatures above it's design limit which will not be the case in engines for which the grade is specified.
You would be right if cam lobes and all the bearings/rings increased their surface area, which is true to some extent maybe. The one car I know of that can use this oil, Honda Fit, might be doing that, I'm not sure. I'm going to rely on the internet here for someone to inform me of how much the bearing surface areas (all) increased to lower the load pressure for lighter oils because I can't find that info. GF-6B emphasizes more boundary lube.
Forget about heavy oils like the 0W-16 grade! Cars like the Honda Fit, Insight etc are already running on a 0W-12 equivalent oil grade if not a 0W-8 in Japan.
Check out the VOA on the Honda ULTRA Next below:
www.bobistheoilguy.com/forums/ubbthreads.php/topics/3709766/1
Now this is a seriously light oil with a KV100 of 5.1cSt and a spectacularly low KV40 of only 21.8cSt.