I was reading an artical about how they are limiting an oil aditive called LDDP due to a sulpher issue. It was pretty technical but the jist of the article was that those of us running older engines with traditional cam and hydraulic lifters needed to watch this. This LDDP helps maintain oil in high friction points. The article went on to say that they had seen an increase in cam failure because of this. On modern engines with rollers and bearings it was not an issue. I need to find the article again and see if there is a link online for this.
I know people are always doing oil comparisons but was unaware that the manufacturers are constantly changing the formulas. Makes it kind of hard to pick a favorite and stay with it.