This analysis is like a redo of the old Southwest Research analysis that was done in the early 2000s.

I used XPD for a lot of years in my diesels and switched to Archoil a few years back b/c of all of the positive results Bill Hewitt (RIP) was talking about from his business.
 
I just watched the review earlier today. The high iron content for the Archoil was a bit concerning, but as they mentioned likely not typical. My last Blackstone oil analysis, which would have been after I started using Archoil AR6400-D was also high on iron. Not high enough according to Blackstone to be concern, but something I need to keep an eye on.
 
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