Is there really that much difference between 5-30 & 5-40?  I am skeptical that this change will have much impact at all.  I hope I am wrong.  Personally, in addition to Amsoil 5-40, I will be adding 8oz of Archoil AR9100 at each oil change.  Cheap insurance to gaurentee I won't experience the bearing failure.
			
			 
 
		 
 
		