Originally Posted by Rob
I would also like to mention that 10w-60 is being used in new BMW engines, which right now have all the HP they can pull from them. Now, why would BMW require 10w-60 if it was too thick to get to the bearings? Also, no offence, but pulling a source that uses a worker at Amsoil can not be justified. The only true tests are provided via an independent, unbaised, research company. Maybe it's just me, but with even 5W-30, I would be afraid of VANOS rattle the whole time.
The numerical data in the link is given by each company as fact. The section at the bottom that i qouted is of course directly from amsoil, and the data reflects the statements.
I have no reason not to beleive those statements myself.. especially with the supporting data.
I seem to recall a small bearing issue regarding the s54 myself, and i have to say that the BMW recommended 10w30 that is used every 15k oil change probably does not suffice and most likely had something to do with the problem. That is speculation on my behalf though.