The Brad Penn® Penn Grade 1® High Performance Oils contain the higher level of anti-wear (ZDDP – zinc dialkyldithiophosphate) and enhanced film strength so critical to proper high performance engine protection. The Penn-Grade 1® oils “typical” 1,500 ppm Zinc (Zn) and 1340-1400 ppm Phosphorus (P) content provide the needed anti-wear protection to critical engine parts, such as piston/cylinder walls, roller cams under heavy valve spring pressure and especially those that employ a solid “flat tappet” type system. As important as the chemistry is to the Penn-Grade 1® oils, it is by no means the whole story. The unique base oil cut used to refine the Penn-Grade 1® High Performance Oils maintain a tremendous affinity to metal surfaces. This naturally occurring “metal wetting” characteristic enables the oil to stay put on your highly stressed engines and makes the Penn-Grade 1® High Performance Oil resist slinging for an extended period of time. Also, rest assured in knowing that the Penn-Grade 1® High Performance Oils are 100% Made in the USA.


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.  The results for both the Blackstone and Southwest Research analysis are listed below:

Brad Penn Product                        Blackstone                   Southwest Research

Penn Grade 1                               zinc 1,214 ppm                     zinc 1,540 ppm
20W-50  #7119                            phos 944 ppm                      phos 1,319 ppm

Penn Grade 1                               zinc 1,424 ppm                     zinc 1,565 ppm  
10W-30 #7150                             phos 1,139 ppm                   phos 1,332 ppm

Brad Penn PCMO                        zinc 689 ppm                        zinc 1,051 ppm
20W-50 SJ #7123*                     phos 522 ppm                       phos 901 ppm

*In some cases we feel our PCMO SAE 20W-50 was sent in for analysis (and not the High Performance Oil SAE 20W-50) which does contain lower Zinc and Phosphorous additive concentration levels.

The difference in results between Blackstone and SRI can be explained by a difference in methodology in analyzing the samples and not differences in the formulation. Blackstone employed measurement techniques more generally employed in analyzing used oils, while SRI employed methods more usually utilized for new multigrade engine oils. The samples provided to both labs were new oils. New oils that have not been subjected to shear often require higher dilution rates in the elemental analysis measured by ICP (Inductively Coupled Plasma) as indicated in method ASTM D5185.