We have historically changed oil on 300 hour intervals and had the wear metals analyzed. In one case, the wear metal analysis showed 35 PPM of iron before adding Prolong AFMT.
After the initial 10% treatment, iron wear metals dropped to 17 PPM.
After the second treatment, iron metals dropped to 13 PPM.
Third treatment produced iron wear metals of 9 PPM.
This was an astonishing 74% drop in wear metals from the baseline of 35 PPM.
We have since extended our oil change interval to 400 hours and still maintained 10 PPM of iron wear metals, or 71% drop.