Anyone figure out high lead numbers with schaeffer

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After reading more than one UOA with elevated lead numbers with Schaeffer’s, has anyone figured out why the slight increase is present?
 
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You're right. Just noticed that difference:

https://bobistheoilguy.com/forums/ubbthreads.php/topics/4491133/2007.5_Ram_Cummins_6.7,_26k_mi#Post4491133
 
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I got elevated lead numbers on Schaeffer in my previous Cummins ISX 15L. Have got 780K miles now on a Detroit 60 using Schaeffer and lead in UOA's is typically in the mid single digit range. Must be a metallurgical issue that Cummins conflicts with Schaeffer.
 
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