Originally Posted By: btanchors
What do you all make of the fact that the 0W-40 SN does not seem to be adopting the reduced calcium/additional magnesium that the other SN grades have? Is it due to Ash limits as ArcoGraphite suggested? If so, since 0W-40 SN retains the more traditional additive package, does this suggest the reduced calcium/additional magnesium is compromised in other areas in order to meet reduced ash levels, since 0W-40 SN is sticking with the conventional package?
That is a good question, one I'd like to know. I think it is due to the lower ash limits. What is odd though is the 15w50 looks like all the other M1 oils. The 0w40 is different.