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. 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.