While both Mobil 1 and Mobil's Delvac 1 are highly regarded oils, it seems Delvac 1 has a slight edge in the opinion polls.
Given the similarity in the additive package (especially when compared to M1 15w-50) and the fact that it is moly-less (seemingly a valuable additive) why is Delvac 1 thought of as superior, even if only slightly? Is it perhaps the viscosity range, or is there more to the story?
Thanks

