For some reason Blackstone lab couldn't figure out how to test oil the same as other labs. They had some kind if hard on for Brad Penn oil and tried to show lower specs / poor results of it's oils. Good thing their results were not given any credit. Way to many racers run Brad Penn oil for it not to be a good quality oil.
Nothing you can buy off the shelf has the levels of Zinc and Phosphorus as Brad Penn. The EPA has slowly worked on all off the shelf oils (including Rotella which many people use) to lower the levels of phosphorous. See note below from Brad Pen web site.
Note:
Penn Grade 1 High Performance Oils contain high zinc and phosphorous additive concentrations which can be detrimental to cars and trucks with catalytic converters. For our Brad Penn Synthetic Blend and Premium Passenger Car Motor oils more suitable for use in vehicles with catalytic converters, please click here. Always consult your owner's manual for proper oil selection.
ZDDP LAB RESULTS
We have seen the question arise on a number of chat rooms and websites about the amount of Zinc and Phosphorus in our Penn Grade 1 High Performance Oils. The questions seem to have arose after a number of people individually sent samples of our products to Blackstone Lab(s) for analysis. The Blackstone report showed a lower Zinc and Phosphorus additive concentration level then our established in house specifications and laboratory results from our ISO 9001:2008 quality control lab proved.
In an effort to clarify any misconception about our product we did our own testing and sent three virgin oil samples (each from the same identical batch) to both Blackstone Lab and Southwest Research Lab for testing. All three Southwest sample results were completely in line with our internal specifications/analysis. The Blackstone zinc and phosphorus results in all three analysis were lower than our internal specifications/analysis and Southwest Research’s lab results.
http://www.penngrade1.com/Zinc.aspx