Bought this oil cause mx no mo 40wt or 50wt Amsoil I need. Thus decide to try out this Schaffer supreme 9000 instead. It is good stuff!! Engine is very smooth and quiet. Previously using 50wt and though that 40wt will result in more vibrations or noise but not the case! Its even quieter! Maybe its because of new oil but I am impressed. Now will monitor to see if my FC will improve due to slightly thinner oil. I also did add a bottle of Liquimoly Ceratec additive (usual additive for my car).