And, I believe the re-formulation was mandated by law to meet the Federal requirements. Currently, to my understanding there are only a few exemptions to the requirements, one being oils designed for special purposes such as racing. Most of the oils that meet the flat tappet requirements are under this category. To my knowledge, Rottela is not one of these. I believe there are several different types of Rottela and some of them have higher zinc formulas. However, the new zinc formulas are not the same as it used to be and not as beneficial as the old. While the numbers are high, the effectiveness may be low.

The Truth About Zinc & Motor Oil | Driven Racing Oil