I do not have it marked on my maint. spreadsheet, but I am pretty sure I dumped in a container of Auto-Rx thousands of miles before the oil change.
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2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.